Issue link: http://itf.uberflip.com/i/447398
42 1. UNACCEPTABLE ATTIRE Sweatshirts, gym shorts, dress shirts, T-shirts or any other inappropriate attire shall not be worn during a match (including the warm-up). Shoes Players are required to wear tennis shoes generally accepted as proper tennis attire. Shoes shall not cause damage to the court other than what is expected during the normal course of a match or practice. Damage to a court may be considered as physical or visible, which may include a shoe that leaves marks beyond what it considered acceptable. The Referee has the authority to determine that a shoe does not meet these criteria and may order the player to change. (a) Grass Court Shoes In a Davis Cup Tie played on grass courts, no shoes other than those with rubber soles, without heels, ribs, studs or coverings, shall be worn by players. Special grass court shoes will not be used without the express approval of the ITF. Such shoes will not be approved unless they comply with the following specifications: The pimples or studs on the base of the sole 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 with a maximum of 10 degree angle slope between the base and the top of the pimple. The durometres shall be between 58 and 63 based on the shore "A" scale. The pimple top diamet er compared to its respective pimple density per square inch shall be within the following guidelines: Pimple Top Diameter Pimple Density Per Square Inch 2.00mm 32 2.25mm 28 2.50mm 24 2.75mm 21 3.00mm 18 Shoes with pimples or studs around the outside of the toes shall not be permitted. The foxing around the toes must be smooth. Players desiring approval of special grass court shoes should submit a sample shoe to the ITF in advance of the Tie. As an alternative to the above specifications, players may also use the special grass court shoes developed, tested and approved by Wimbledon. These special grass court shoes are available from the ITF upon request.