The 100 Percent Altec Helmet is a superb choice for the advanced rider. A ventilated All-Mountain helmet that is protective, lightweight and inspires confidence. Featuring Smartshock® suspended rotational system, the ALTEC's Smartshock® elastomers reduce energy transfer to the brain over a wide range of speed and impact types. 100 Percent Altec Helmet Features Smartshock® - 14 Point Smartshock® Rotational Protective System. Multi-Density EPS foam - injection molded with polycarbonate. Massive airflow - With an impressive 15 ventilation ports. Altec 350g / M-Shell - Expanded coverage while still lightweight. Sunglass Storage - Integrated sunglass storage system. Multi-point adjustable visor designed - For maximum vision and goggle stowage. Anti-Microbial liner - Washable, moisture-wicking . Adjustable Ratcheting Fitment System. Nexus Push Release Snap-Buckle. Size-specific molds - XS/S, S/M, and L/XL. 100 Percent Altec Helmet Materials Material: 70% Expanded Polystyrene, 20% Polycarbonate, 5% Polyester, 5% Nylon. The ALTEC complies with ASTM, CPSC, CE and AS/NZ Bicycle Standards.