Size: Small / Medium, 19.25" - 23" (Measurement at head circumference just above ears/eyebrows) Cap Size: 6 1/8" - 7" * Meets every performance requirement in ASTM F2439, "Standard Specification for Head gear Used in Soccer" * Permitted by FIFA, the U.S. Soccer Federation, and National Fed. of State High School Associations * Impact-absorbing foam layer covers and protects the forehead and temples without altering ball rebound speeds * CoolMax liner fabric accelerates moisture evaporation to keep the head cool