2nd Skull Protective Skull Cap – XRD Impact-Absorbing Technology, Fits Under Any Helmet

Protective, impact-absorbing technology: features thin, 2mm XRD impact-absorbing technology for superior protection. The material is flexible at rest, but can instantaneously harden under pressure, thus helping mitigate the effects of sudden impacts.
Proven Performance: permitted for high school use in multiple sports and activities. Designed to fit comfortably under any helmet by creating an independent layer between the head and helmet, or as a stand-alone in non-helmet activities.
Lightweight, moisture-wicking fabric: composed of a 20% Spandex, 80% Polyester fabric blend to provide a comfortable fit that conforms to your head while keeping you cool. Treated to help prevent odor. Hand wash only.
Game changing protection for athletes: 2nd Skull provides protection against impacts and has improved the performance of all helmets it has been tested with. Focus on your performance and reduce the risk with the 2nd Skull Protective Skull Cap.
Size Chart: Youth: Circumference – 19”-21”; Teen/Adult: Circumference – 21”-24.5”; XL: Circumference – 24.5” – 26”; Proudly made in the U.S.A.