Issue link: http://itf.uberflip.com/i/772089
38 Special grass court shoes will not be used without the express approval of the GSB; such shoes will not be approved unless they comply with the following specifications: 1. The pimples or studs on the base of the sole should be vertical from the outsole and shall have maximum top diameter of three (3) millimetres and a minimum top diameter of two (2) millimetres. The maximum height of the pimples or studs shall be two (2) millimetres, from the base of the shoe. The hardness of any pimple shall be between 55 and 60 based on a shore "A" scale. The number of pimples per square inch shall be no less than 15 and no more than 28. 2. No pimples or studs may be visible when the shoe is placed on a flat horizontal surface and viewed vertically. The foxing/sidewall around the toes must be smooth and may only be contoured in the medial forefoot and medial toe area but only within the following restrictions. The contoured area may begin in the transition area between outsole and sidewall but can only extend to a maximum of 1.5 centimetre up the sidewall as measured from the base of the outsole. The contoured area must be smooth (not textured or undulating) but can be stepped with no more than five (5) steps each no more than one (1) millimeter in depth. 3. Forefoot and heal areas may be separated but there should be no more than a two (2) millimetres step in the outsole of the shoe. 4. No manufacturer's identification is to be used on the base of the outsole. See Appendix B for example specification sheet. Players desiring approval of special grass court shoes should submit a sample shoe to the GSB at least ninety (90) days in advance of Wimbledon. ii. Clay Court Shoes Players are required to wear tennis shoes generally accepted for play on clay courts. The Referee has the authority to determine that a tennis shoe's sole does not conform to such customs and standards and can prohibit its use at Roland Garros. Grass court shoes shall not be worn during a match at Roland Garros. b. White Clothing and Footwear Including the warm-up period, players at Wimbledon must be dressed almost entirely in white.