POC Skull X Ski Race Helmet LINER: The EPP liner provides maximum impact protection in case of a significant fall and will not deform permanently on impact. Can withstand multiple impacts with a very limited loss of performance. RELIEF: Comfortable LD (low density) foam lining that is easily detachable for cleaning. FEATURES: Ear chambers designed to improve balance and hearing without compromising safety and fit. PROTECTION: Injected PC/ABS shell that is tapered for resistance and protection. OPTIONS: Comes in in 4 colors and 6 different sizes.