Nokaic Helmet for Extreme Sports, very comfortable and resistant, with wheel system at the back of the helmet to regulate the size. Material: the exterior shell is made from ABS (resistant and hard ma more→terial) and the interior is made from EPS, very light material with capacity to absorb impacts and provide heat insulation.Perfect for extreme sports: scooter freestyle, roller, skateboard, inline skating, snowboard, BMX, mountain board, roller fitness and BTT.