• Polymer Compound shell in two sizes • Optimized casual fit without compromising safety • Comfort liner in 3 different thicknesses for custom fit options • 360° Turbine Technology • Reduced peak brain acceleration by up to 30% at impact speeds associated with concussion • Reduces peak brain rotational acceleration by up to 40% • In-molded impact foam for great energy absorption • Moisture wicking, breathable and washable liner • 11 vents • Certified and tested: AS/NZS 2063:2008, EN1078, CPSC 1203, ASTM F2032-06 • Weight: from 280g (0,55 lbs) • Plastic Free Recyclable Packaging • Sizing: #XS/S (51-55cm – 20-21 ") #M/L (55-59cm – 21 5/8 - 23 1/4")