Dual Axis Knee Guard features include 3 Dimensionally designedfor optimal fit, anatomically correctdual pivot points, lightweightat only 1.9 lbs (850g) per pair, slim design for use over or under riding pants, 9 large ventshelp keep you cool, made from High Density Poly Ethylene and HDPE, washable Leatt foam, strap system resists binding. Impact tested and CE certified to EN 1621-1 and abrasion tested and CE certified to EN 13595-2, Level 2.