OUTER SHELL: SUPER HIGH IMPACT STRENGTH, EXCELLENT PROPERTY UNDER HIGH OR LOW TEMPERATURE ABS MATERIAL. INNER SHELL(EPS): HIGH FOAM DENSITY, LIGHT WEIGHT AND OPTIMAL IMPACT ABSORPTION. COMFORTABLE PADDING: IT IS REMOVABLE AND WASHABLE LINER MADE OF MOISTURE WICKING FABRIC. VENTILATION: FRONT ,TOP AND REAR VENTILATION SLOTS OFFER A GREAT AIR FLOWING IT HAS A NECK PROTECTIVE DESIGNED HARNESS WITH QUICK RELEASE ITW BUCKLE, DURAFLEX DIVIDER AND CHIN PADDING TO ENSURE A SECURE AND COMFORTABLE FIT. PEAK: FLEXIBLE PEAK SIZE ADJUSTMENT: ADJUSTABLE DIAL FIT