Features a super easy in/out 'X-Up' strapping system, which locks in on both sides of your knee. This design is very good at reducing twisting or slipping. Hard shell kneecaps and asymmetrical hard shell shin plates provide impact protection. Vented for comfort and breath-ability. These knee/shins are designed for aggressive DH and freeriders. They are not the best for XC. The material is rigid and the upper part of the pad could cause chafing on your upper knee. Size L/XL will fit riders taller than 5'10". These pads take one second to put on and take off. The clips on the sides of the knee are ingenious and make life little less complicated.