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Football · Interesting Facts

Chapter 5: Equipment & Technology

10 parts · 10 tests · 100 facts · updated 23 October 2026 · markdown

How the game's equipment and venues changed: balls from pig's bladders to the World Cup's named balls, boots and their makers, kits that made headlines, trophies as objects, engineered stadiums, lights and clocks, and pitches and posts.

5.51Balls, Boots, Cards & Match-Day Technology

The Telstar ball's TV-driven design, the traffic light that inspired the card system, boots that won a World Cup final in the rain, and the string of officiating technologies that arrived between 2014 and 2022.

Test 1Ball, boot, card and officiating-technology historyTake a test

  1. Adidas designed the Telstar's 12 black pentagons and 20 white hexagons so the ball would be easy to see on the black-and-white TVs most fans still owned in 1970.

    Source: Adidas / FIFA, news.adidas.com/timeline/how-adidas-has-shaped-the-history-of-world-cup-balls-from-1970-to-the-present-day · recall

  2. After a confrontational Argentina-England quarter-final at the 1966 World Cup, referee Ken Aston saw a traffic light change and thought 'yellow, take it easy; red, stop'; the cards debuted at the 1970 World Cup.

    Source: History.com / Smithsonian Magazine, history.com/articles/yellow-red-cards-1966-world-cup · recall

  3. On a rain-soaked pitch in Bern, Adi Dassler's longer screw-in studs gave West Germany's players better traction than Hungary's fixed leather studs, helping the underdogs win 3-2 in the 'Miracle of Bern'.

    Source: DFB (German FA), dfb.de/en/news/detail/world-cup-rewind-1954-the-miracle-of-bern-187757 · recall

  4. VAR made its World Cup debut in France's opening match against Australia in 2018, confirming a foul on Antoine Griezmann and awarding a penalty.

    Source: FIFA Museum, fifamuseum.com/en/explore/fifamuseumplus/past-exhibitions/innovation-in-action/the-first-time-var-made-its-fifa-world-cup-debut-with-griezmann · recall

  5. FIFA picked GoalControl-4D over Hawk-Eye and two other rivals for the 2014 World Cup, first used in the opening match between Brazil and Croatia.

    Source: Guinness World Records, guinnessworldrecords.com/world-records/116659-first-football-soccer-fifa-world-cup-to-use-goal-line-technology · recall

  6. At the 2022 World Cup, 12 tracking cameras captured up to 29 data points on each player 50 times per second to help make faster, more accurate offside calls.

    Source: FIFA, inside.fifa.com/innovation/world-cup-2022/semi-automated-offside-technology · recall

  7. Unemployed football fan Heine Allemagne spent 14 years developing vanishing spray, which made its World Cup debut in the Brazil-Croatia opening match in 2014, after years of use in South American football.

    Source: Cross-checked histories of vanishing spray's invention · recall

  8. An exhibition match between two Sheffield teams under floodlights at Bramall Lane on 14 October 1878 is recognised as the first floodlit football match, though the Football League did not sanction competitive floodlit games until 1956.

    Source: Cross-checked histories of football's first floodlit match · recall

  9. British ball-maker William Sykes patented rubber-lined goalkeeper gloves in 1885, but adoption was slow; River Plate's Amadeo Carrizo became the first goalkeeper widely recognised for wearing them regularly, in the 1940s and 50s.

    Source: Cross-checked histories of goalkeeper glove development · recall

  10. QPR installed an Omniturf artificial pitch at Loftus Road in 1981; after years of player complaints, the Football Association banned artificial pitches from the top flight in 1991.

    Source: Cross-checked histories of QPR's artificial pitch · recall

5.52Shirts, Stadiums & Broadcasting Firsts

How shirt sponsorship, squad numbers, stadium safety and broadcasting changed the matchday experience, plus two more ball stories and a boot that made history for its colour, not its studs.

Test 1Shirts, stadiums, balls and broadcasting firstsTake a test

  1. Kettering Town wore 'Kettering Tyres' on their shirts in January 1976, but the FA ruled it illegal; Liverpool's 1979 deal with Hitachi became the first officially accepted shirt sponsorship in English football.

    Source: Cross-checked histories of English football shirt sponsorship · recall

  2. Former Liverpool player Craig Johnston developed around 1,000 prototypes, starting from rubber wrapped around his boot, before Adidas launched the Predator in 1994 with rubber fins to improve grip and swerve.

    Source: Cross-checked histories of the Adidas Predator's invention · recall

  3. Published after the Hillsborough disaster, the Taylor Report recommended all-seater stadiums; the top two English divisions were required to comply by August 1994.

    Source: Cross-checked histories of the Taylor Report · recall

  4. The Azteca's synthetic construction, with an Aztec-inspired design honouring host Mexico, kept its shape better than leather in wet conditions and at altitude.

    Source: Cross-checked histories of Adidas World Cup match balls · recall

  5. Everton installed undersoil heating at Goodison Park in 1958, using 20 miles of wire, though other clubs were slow to follow: Liverpool did not install their own system until 1980.

    Source: Cross-checked histories of Goodison Park's undersoil heating · recall

  6. Alan Ball wore white boots in the 1970 Charity Shield, the first coloured football boots; they were sold as Hummel's, though Ball later said the pair he actually wore were Adidas boots painted white because the Hummel ones hurt his feet.

    Source: Cross-checked histories of Alan Ball's white boots · recall

  7. Players and goalkeepers, including England coach Fabio Capello, criticised the Jabulani's unpredictable swerve and dip, blaming its unusually light construction.

    Source: Cross-checked reporting on the 2010 Jabulani ball controversy · recall

  8. Squad numbers and shirt names became compulsory across the Premier League from August 1993, replacing the traditional 1-11 match-day numbering.

    Source: Cross-checked histories of Premier League squad numbering · recall

  9. The BBC broadcast a 15-minute segment of a friendly between Arsenal and Arsenal Reserves on 16 September 1937, the first football match shown on live television.

    Source: Guinness World Records, guinnessworldrecords.com/world-records/777845-first-televised-football-soccer-broadcast · recall

  10. Cardiff's Millennium Stadium opened in 1999 with the UK's first fully retractable roof; the 2001 FA Community Shield became the first football match played under it closed.

    Source: Principality Stadium official site, principalitystadium.wales/information/about-the-venue · recall

5.53World Cup Balls by Name

Tango España, Etrusco Unico, Questra, Tricolore, Fevernova, Jo'bulani and the Champions League Finale.

Test 1World Cup ballsTake a test

  1. From 1986 the World Cup ball was fully synthetic.

    Source: adidas, 'World Cup balls through history' (adidas.com); FIFA Museum, 'The official match balls' (fifamuseum.com) · recall

  2. The foam made it a little faster and more water-resistant.

    Source: adidas, 'World Cup balls through history' (adidas.com); FIFA Museum, 'The official match balls' (fifamuseum.com) · recall

  3. Its design was inspired by space travel and the American space programme.

    Source: adidas, 'World Cup balls through history' (adidas.com); FIFA Museum, 'The official match balls' (fifamuseum.com) · recall

  4. Blue, white and red recalled the French flag, with a Gallic rooster in the design.

    Source: adidas, 'World Cup balls through history' (adidas.com); FIFA Museum, 'The official match balls' (fifamuseum.com) · recall

  5. Its colours and triangles drew on Asian culture for the first World Cup in Asia.

    Source: adidas, 'World Cup balls through history' (adidas.com); FIFA Museum, 'The official match balls' (fifamuseum.com) · recall

  6. It was a gold version of the tournament ball, for the final in Johannesburg.

    Source: adidas, 'World Cup balls through history' (adidas.com); FIFA Museum, 'The official match balls' (fifamuseum.com) · recall

  7. A new Finale has been made for each season since 2000-01.

    Source: UEFA, 'The Champions League starball' (uefa.com); adidas · recall

  8. 1982, 1990, 1994 and 1998.

    Source: adidas, 'World Cup balls through history' (adidas.com); FIFA Museum, 'The official match balls' (fifamuseum.com) · recall

  9. 1998, 2002 and the 2010 final.

    Source: adidas, 'World Cup balls through history' (adidas.com); FIFA Museum, 'The official match balls' (fifamuseum.com) · recall

  10. Three lion heads decorated each of its triad patterns.

    Source: adidas, 'World Cup balls through history' (adidas.com); FIFA Museum, 'The official match balls' (fifamuseum.com) · recall

5.54Boots and Their Makers

The Dassler brothers, the Pelé Pact, the Puma King, the Copa Mundial and the Mercurial.

Test 1Football bootsTake a test

  1. The brothers had made shoes together since the 1920s.

    Source: adidas Group, 'History' (adidas-group.com); PUMA, 'Our history' (about.puma.com) · recall

  2. Adolf, known as Adi, founded Adidas.

    Source: adidas Group, 'History' (adidas-group.com); PUMA, 'Our history' (about.puma.com) · recall

  3. Cameras close in on him bending down before the quarter-final against Peru.

    Source: PUMA, 'The PUMA King' and 'Pelé and the PUMA King' (about.puma.com) · recall

  4. It became one of the most famous boots of its era.

    Source: PUMA, 'The PUMA King' and 'Pelé and the PUMA King' (about.puma.com) · recall

  5. It is still on sale, more than four decades later.

    Source: adidas, 'Copa Mundial since 1979' (adidas.com) · recall

  6. It was very light and silver, blue and yellow.

    Source: Nike, 'Mercurial: 1998' (nike.com) · recall

  7. Early boots were heavy, ankle-high work boots that soaked up water.

    Source: National Football Museum, 'Football boots' (nationalfootballmuseum.com) · recall

  8. 1968, 1970, 1979 and 1998.

    Source: PUMA, 'The PUMA King' and 'Pelé and the PUMA King' (about.puma.com) · recall

  9. 1924, 1948, 1949 and 1994.

    Source: adidas Group, 'History' (adidas-group.com); PUMA, 'Our history' (about.puma.com) · recall

  10. Adidas and Puma both stayed in the brothers' home town after the split.

    Source: adidas Group, 'History' (adidas-group.com); PUMA, 'Our history' (about.puma.com) · recall

5.55Kits That Made Headlines

Cameroon's sleeveless and one-piece kits, Campos' colours, Admiral's replicas and United's grey kit.

Test 1Famous kitsTake a test

  1. FIFA fined the federation and docked World Cup qualifying points; the deduction was later lifted.

    Source: FIFA, 'Cameroon kit rulings 2002 and 2004' (inside.fifa.com); BBC Sport reports · recall

  2. They had worn the sleeveless design at the Africa Cup of Nations earlier that year.

    Source: FIFA, 'Cameroon kit rulings 2002 and 2004' (inside.fifa.com); BBC Sport reports · recall

  3. He also played some matches as a striker.

    Source: Mexican Football Federation, 'Jorge Campos' (miseleccion.mx) · recall

  4. Its deal with Leeds United began the modern replica-kit trade.

    Source: National Football Museum, 'Admiral and the replica shirt' (nationalfootballmuseum.com) · recall

  5. West Germany wore white, so England changed.

    Source: The FA, '1966: England's red shirts' (englandfootball.com) · recall

  6. The team kept the colour after Italy became a republic in 1946.

    Source: FIGC, 'Perché la Nazionale veste d'azzurro' (figc.it) · recall

  7. They were 3-0 down and lost 3-1; the grey shirt was never worn again.

    Source: Manchester United, 'The grey kit at The Dell, 1996' (manutd.com) · recall

  8. 1966, the 1970s, 1986 and 1996.

    Source: National Football Museum, 'Admiral and the replica shirt' (nationalfootballmuseum.com) · recall

  9. 1991, 1994, 2002 and 2004.

    Source: FIFA, 'Cameroon kit rulings 2002 and 2004' (inside.fifa.com); BBC Sport reports · recall

  10. Hummel's design is one of the best-remembered World Cup shirts.

    Source: Dansk Boldspil-Union, '1986: Danish Dynamite' (dbu.dk); hummel heritage · recall

5.56Trophies as Objects

Lafleur's Jules Rimet, the 1911 FA Cup, Big Ears, a gold Premier League trophy and the salad bowl.

Test 1TrophiesTake a test

  1. The gold-plated figure represented Nike, the Greek goddess of victory.

    Source: FIFA Museum, 'The Jules Rimet Trophy' (fifamuseum.com); The FA, 'The FA Cup trophy' (thefa.com) · recall

  2. Fattorini & Sons made it; City won it at the first attempt.

    Source: FIFA Museum, 'The Jules Rimet Trophy' (fifamuseum.com); The FA, 'The FA Cup trophy' (thefa.com) · recall

  3. The Swiss silversmith Jörg Stadelmann made it in 1967 with its large handles.

    Source: UEFA, 'The Champions League trophy' (uefa.com) · recall

  4. Real Madrid, Ajax, Bayern, Milan and Liverpool all earned a trophy of their own.

    Source: UEFA, 'The Champions League trophy' (uefa.com) · recall

  5. The gold trophy was made to mark the unique feat.

    Source: Premier League, 'The Premier League trophy' and 'The gold trophy of 2004' (premierleague.com) · recall

  6. The base has been enlarged to make room for the plaques.

    Source: CONMEBOL, 'El trofeo de la Copa Libertadores' (conmebol.com) · recall

  7. France Football first gave the award in 1956.

    Source: FIFA Museum, 'The Jules Rimet Trophy' (fifamuseum.com); The FA, 'The FA Cup trophy' (thefa.com) · recall

  8. 1911, 1930, 1967 and 1974.

    Source: FIFA Museum, 'The Jules Rimet Trophy' (fifamuseum.com); The FA, 'The FA Cup trophy' (thefa.com) · recall

  9. 1966, 1973, 1976, 1994 and 2005.

    Source: UEFA, 'The Champions League trophy' (uefa.com) · recall

  10. The Meisterschale is known in Germany as the Salatschüssel.

    Source: DFL, 'Die Meisterschale' (bundesliga.com) · recall

5.57Stadium Engineering

Sliding pitches, a floating pitch, a stadium of containers, colour-changing panels and a quarry ground.

Test 1Stadium engineeringTake a test

  1. The grass slides away in three sections, revealing the synthetic surface below.

    Source: Tottenham Hotspur, 'Stadium: the retractable pitch' (tottenhamhotspur.com) · recall

  2. The pitch grows outside in daylight and is moved back in for matches.

    Source: FC Schalke 04, 'VELTINS-Arena' (schalke04.de) · recall

  3. The dome was a 2002 World Cup venue.

    Source: Sapporo Dome, 'Hovering soccer stage' (sapporo-dome.co.jp) · recall

  4. 974 is also Qatar's international dialling code.

    Source: FIFA, 'Stadium 974' (fifa.com, 2022) · recall

  5. Red has been used for Bayern home games.

    Source: FC Bayern, 'Allianz Arena' (allianz-arena.com) · recall

  6. The arch helps hold up the roof and can be seen across London.

    Source: Wembley Stadium, 'The arch' (wembleystadium.com) · recall

  7. Eduardo Souto de Moura's design has stands on only two sides.

    Source: SC Braga, 'Estádio Municipal de Braga' (scbraga.pt) · recall

  8. 1996, 2001, 2005 and 2007.

    Source: Johan Cruijff ArenA, 'History' (johancruijffarena.nl) · recall

  9. 2001, 2003, 2019 and 2021.

    Source: Sapporo Dome, 'Hovering soccer stage' (sapporo-dome.co.jp) · recall

  10. It was the first World Cup stadium designed to be fully dismantled.

    Source: FIFA, 'Stadium 974' (fifa.com, 2022) · recall

5.58Lights and Clocks

The first floodlit league match, Wolves and Honvéd, Highbury's clock and the Munich clock.

Test 1Floodlights and clocksTake a test

  1. Floodlights had been used for friendlies for years before the League allowed them.

    Source: Portsmouth FC, 'The first Football League floodlit match, 1956' (portsmouthfc.co.uk) · recall

  2. Arsenal won 6-1 under their new lights.

    Source: Arsenal FC (arsenal.com) and Manchester United (manutd.com) heritage pages · recall

  3. English papers called Wolves 'champions of the world', and a French journalist proposed a proper test.

    Source: Wolverhampton Wanderers, 'The floodlit friendlies' (wolves.co.uk); UEFA, 'How the European Cup began' · recall

  4. One end of the Emirates is called the Clock End too.

    Source: Arsenal FC (arsenal.com) and Manchester United (manutd.com) heritage pages · recall

  5. United beat Anderlecht 10-0 there in September 1956.

    Source: Manchester United, 'Old Trafford history' and 1956-57 European Cup reports (manutd.com) · recall

  6. UEFA launched the European Cup the following year.

    Source: Wolverhampton Wanderers, 'The floodlit friendlies' (wolves.co.uk); UEFA, 'How the European Cup began' · recall

  7. Opponents included Spartak Moscow, Honvéd and Real Madrid.

    Source: Wolverhampton Wanderers, 'The floodlit friendlies' (wolves.co.uk); UEFA, 'How the European Cup began' · recall

  8. 1878, 1954, 1956 and 2006.

    Source: Wolverhampton Wanderers, 'The floodlit friendlies' (wolves.co.uk); UEFA, 'How the European Cup began' · recall

  9. 1958, 1968 and 2006.

    Source: Arsenal FC (arsenal.com) and Manchester United (manutd.com) heritage pages · recall

  10. The plane crashed at Munich-Riem airport on 6 February 1958.

    Source: Arsenal FC (arsenal.com) and Manchester United (manutd.com) heritage pages · recall

5.59Balls Before the Telstar

Pig's bladders, Goodyear's rubber, two balls in 1930, a valve in 1950 and Haller's souvenir.

Test 1Early footballsTake a test

  1. His vulcanised rubber ball did not need a pig's bladder inside.

    Source: National Football Museum, 'The history of the football' (nationalfootballmuseum.com) · recall

  2. Argentina's ball was used before half-time and Uruguay's after; Uruguay won 4-2.

    Source: FIFA, 'World Cup 1930: the two balls of the final' (inside.fifa.com) · recall

  3. Older balls were laced shut after the bladder was pumped up.

    Source: adidas, 'World Cup balls through history' (adidas.com); FIFA Museum, 'The official match balls' (fifamuseum.com) · recall

  4. Hurst was expected to keep it after his hat-trick; the ball came back to England in 1996.

    Source: FIFA, '1966: the final ball's journey' (inside.fifa.com) · recall

  5. Brown leather balls had been the norm until then.

    Source: The FA, 'History of the Laws: the white ball' (thefa.com) · recall

  6. Players complained of pain and injury from heading them.

    Source: National Football Museum, 'The history of the football' (nationalfootballmuseum.com) · recall

  7. It was the orange-brown Challenge 4-Star.

    Source: FIFA, '1966: the final ball's journey' (inside.fifa.com) · recall

  8. 1855, 1930, 1950 and 1966.

    Source: National Football Museum, 'The history of the football' (nationalfootballmuseum.com) · recall

  9. 1930, 1950 and 1966.

    Source: FIFA, '1966: the final ball's journey' (inside.fifa.com) · recall

  10. Heading the laced seam of a wet, heavy ball was painful.

    Source: National Football Museum, 'The history of the football' (nationalfootballmuseum.com) · recall

5.60Pitches and Posts

Square posts at Hampden, plastic pitches, the Baseball Ground, pallets in Cardiff and Huish's slope.

Test 1Pitches and goalpostsTake a test

  1. The club later sold the ground to the Scottish FA.

    Source: Queen's Park FC, 'Our history' (queensparkfc.co.uk) · recall

  2. Luton's pitch arrived in 1985; Oldham and Preston followed.

    Source: EFL, 'Artificial pitches in the Football League' (efl.com) · recall

  3. Preston were the last to replace theirs with grass.

    Source: EFL, 'Artificial pitches in the Football League' (efl.com) · recall

  4. Sir Francis Ley built it after a visit to the United States; Derby played there from 1895 to 1997.

    Source: Derby County, 'The Baseball Ground' heritage pages (dcfc.co.uk) · recall

  5. The grass had to be replaced again and again.

    Source: Johan Cruijff ArenA, 'History' (johancruijffarena.nl) · recall

  6. The pallets can be taken out for concerts and other events.

    Source: Principality Stadium, 'The pitch' (principalitystadium.wales) · recall

  7. Big clubs dreaded FA Cup ties there.

    Source: Yeovil Town FC, 'Huish: the sloping pitch' (ytfc.net) · recall

  8. 1981, 1985, 1996 and 1997.

    Source: EFL, 'Artificial pitches in the Football League' (efl.com) · recall

  9. About 1890, 1899, 1996 and 1999.

    Source: Principality Stadium, 'The pitch' (principalitystadium.wales) · recall

  10. Two of its shots hit the square woodwork in a 1-0 defeat; the posts are now in the club museum.

    Source: AS Saint-Étienne, 'Les poteaux carrés' (asse.fr); Musée des Verts · recall

Sources

Primary/official sources where they exist: FIFA (fifa.com, inside.fifa.com), the FIFA Museum (fifamuseum.com), Adidas (news.adidas.com), the DFB - German FA (dfb.de), Guinness World Records. Several older equipment facts rely on multiple cross-checked non-Wikipedia accounts, since no single official archive page was found for them - flagged per question. No Wikipedia citations. Paraphrased in original wording; original questions authored.

  • adidas, 'World Cup balls through history' (adidas.com); FIFA Museum, 'The official match balls' (fifamuseum.com)10
  • adidas Group, 'History' (adidas-group.com); PUMA, 'Our history' (about.puma.com)4
  • FIFA Museum, 'The Jules Rimet Trophy' (fifamuseum.com); The FA, 'The FA Cup trophy' (thefa.com)4
  • Arsenal FC (arsenal.com) and Manchester United (manutd.com) heritage pages4
  • Wolverhampton Wanderers, 'The floodlit friendlies' (wolves.co.uk); UEFA, 'How the European Cup began'4
  • National Football Museum, 'The history of the football' (nationalfootballmuseum.com)4
  • PUMA, 'The PUMA King' and 'Pelé and the PUMA King' (about.puma.com)3
  • FIFA, 'Cameroon kit rulings 2002 and 2004' (inside.fifa.com); BBC Sport reports3
  • UEFA, 'The Champions League trophy' (uefa.com)3
  • FIFA, '1966: the final ball's journey' (inside.fifa.com)3
  • EFL, 'Artificial pitches in the Football League' (efl.com)3
  • National Football Museum, 'Admiral and the replica shirt' (nationalfootballmuseum.com)2
  • Sapporo Dome, 'Hovering soccer stage' (sapporo-dome.co.jp)2
  • FIFA, 'Stadium 974' (fifa.com, 2022)2
  • Johan Cruijff ArenA, 'History' (johancruijffarena.nl)2
  • Principality Stadium, 'The pitch' (principalitystadium.wales)2
  • Adidas / FIFA, news.adidas.com/timeline/how-adidas-has-shaped-the-history-of-world-cup-balls-from-1970-to-the-present-day1
  • History.com / Smithsonian Magazine, history.com/articles/yellow-red-cards-1966-world-cup1
  • DFB (German FA), dfb.de/en/news/detail/world-cup-rewind-1954-the-miracle-of-bern-1877571
  • FIFA Museum, fifamuseum.com/en/explore/fifamuseumplus/past-exhibitions/innovation-in-action/the-first-time-var-made-its-fifa-world-cup-debut-with-griezmann1
  • Guinness World Records, guinnessworldrecords.com/world-records/116659-first-football-soccer-fifa-world-cup-to-use-goal-line-technology1
  • FIFA, inside.fifa.com/innovation/world-cup-2022/semi-automated-offside-technology1
  • Cross-checked histories of vanishing spray's invention1
  • Cross-checked histories of football's first floodlit match1
  • Cross-checked histories of goalkeeper glove development1
  • Cross-checked histories of QPR's artificial pitch1
  • Cross-checked histories of English football shirt sponsorship1
  • Cross-checked histories of the Adidas Predator's invention1
  • Cross-checked histories of the Taylor Report1
  • Cross-checked histories of Adidas World Cup match balls1
  • Cross-checked histories of Goodison Park's undersoil heating1
  • Cross-checked histories of Alan Ball's white boots1
  • Cross-checked reporting on the 2010 Jabulani ball controversy1
  • Cross-checked histories of Premier League squad numbering1
  • Guinness World Records, guinnessworldrecords.com/world-records/777845-first-televised-football-soccer-broadcast1
  • Principality Stadium official site, principalitystadium.wales/information/about-the-venue1
  • UEFA, 'The Champions League starball' (uefa.com); adidas1
  • adidas, 'Copa Mundial since 1979' (adidas.com)1
  • Nike, 'Mercurial: 1998' (nike.com)1
  • National Football Museum, 'Football boots' (nationalfootballmuseum.com)1
  • Mexican Football Federation, 'Jorge Campos' (miseleccion.mx)1
  • The FA, '1966: England's red shirts' (englandfootball.com)1
  • FIGC, 'Perché la Nazionale veste d'azzurro' (figc.it)1
  • Manchester United, 'The grey kit at The Dell, 1996' (manutd.com)1
  • Dansk Boldspil-Union, '1986: Danish Dynamite' (dbu.dk); hummel heritage1
  • Premier League, 'The Premier League trophy' and 'The gold trophy of 2004' (premierleague.com)1
  • CONMEBOL, 'El trofeo de la Copa Libertadores' (conmebol.com)1
  • DFL, 'Die Meisterschale' (bundesliga.com)1
  • Tottenham Hotspur, 'Stadium: the retractable pitch' (tottenhamhotspur.com)1
  • FC Schalke 04, 'VELTINS-Arena' (schalke04.de)1
  • FC Bayern, 'Allianz Arena' (allianz-arena.com)1
  • Wembley Stadium, 'The arch' (wembleystadium.com)1
  • SC Braga, 'Estádio Municipal de Braga' (scbraga.pt)1
  • Portsmouth FC, 'The first Football League floodlit match, 1956' (portsmouthfc.co.uk)1
  • Manchester United, 'Old Trafford history' and 1956-57 European Cup reports (manutd.com)1
  • FIFA, 'World Cup 1930: the two balls of the final' (inside.fifa.com)1
  • The FA, 'History of the Laws: the white ball' (thefa.com)1
  • Queen's Park FC, 'Our history' (queensparkfc.co.uk)1
  • Derby County, 'The Baseball Ground' heritage pages (dcfc.co.uk)1
  • Yeovil Town FC, 'Huish: the sloping pitch' (ytfc.net)1
  • AS Saint-Étienne, 'Les poteaux carrés' (asse.fr); Musée des Verts1