Since the 1999-2000 school year, soccer balls used in interscholastic competition in sports for which the National Federation of State High School Associations (NFHS) writes playing rules are required to have the NFHS authenticating mark.
Ball Testing Requirements:
- Made of leather or other suitable material that is weather resistant
- Of a circumference of not more than 70 cm (28 ins) and not less than 68 cm (27 ins)
- Not more than 453 g (16 oz) in weight and not less than 396 g (14 oz) at the start of the match
- The ball shall be inflated to manufacturer’s recommended pressure
For additional information on NFHS, you can visit their web site by clicking here.