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In association football, kit (also referred to as strip or soccer uniform) is the standard equipment and attire worn by players. The sport's Laws of the Game specify the minimum kit which a player must use, and also prohibit the use of anything that is dangerous to either the player or another participant. Individual competitions may stipulate further restrictions, such as regulating the size of logos displayed on shirts and stating that, in the event of a match between teams with identical or similar colours, the away team must change to different coloured attire.

Footballers generally wear identifying numbers on the backs of their shirts. Originally a team of players wore numbers from 1 to 11, corresponding roughly to their playing positions, but at the professional level this has generally been superseded by squad numbering, whereby each player in a squad is allocated a fixed number for the duration of a season. Professional clubs also usually display players' surnames or nicknames on their shirts, above (or, infrequently, below) their squad numbers.

Football kit has evolved significantly since the early days of the sport when players typically wore thick cotton shirts, knickerbockers and heavy rigid leather boots. In the twentieth century, boots became lighter and softer, shorts were worn at a shorter length, and advances in clothing manufacture and printing allowed shirts to be made in lighter synthetic fibres with increasingly colourful and complex designs. With the rise of advertising in the 20th century, sponsors' logos began to appear on shirts, and replica strips were made available for fans to purchase, generating significant amounts of revenue for clubs.

The Laws of the Game set out the basic equipment which must be worn by all players in Law 4: The Players' Equipment. Five separate items are specified: shirt (also known as a jersey), shorts, socks (also known as stockings), footwear and shin pads. Goalkeepers are allowed to wear tracksuit bottoms instead of shorts.

While most players wear studded football boots ("soccer shoes" or "cleats" in U.S. English), the Laws do not specify that these are required. Shirts must have sleeves (both short and long sleeves are accepted), and goalkeepers must wear shirts which are easily distinguishable from all other players and the match officials. Thermal undershorts may be worn, but must be the same colour as the shorts themselves. Shin pads must be covered entirely by the stockings, be made of rubber, plastic or a similar material, and "provide a reasonable degree of protection". The only other restriction on equipment defined in the Laws of the Game is the requirement that a player "must not use equipment or wear anything that is dangerous to himself or another player".


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