ADVANCED SPORTS HEADGEAR: The F90 Premier Performance Headgear represents the latest advancements in performance technology and Tru-Play design INTERCHANGEABLE PADDING: The Premier headgear features an advanced Truefit system, which is comprised of the new x-band design and new interchangeable back padding LIGHTWEIGHT/LOW PROFILE: Advanced Truefit System that provides expanded coverage while maintaining a low profile, custom and comfortable fit COOL MAX FABRIC: The Premier is constructed with Forcebloc foam and an inner lining of Cool Max fabric to accelerate moisture evaporation, allowing the player to keep their head in the game SIZING: Measure completely around your forehead at the fullest part pulling the tape measure snug. Small/Medium: 19 to 22 inches (49-56 cm), Large: 21 7/8 to 24 inches (55-62 cm)