The Joint VPD System Knee is a highly flexible, 2-ply knee protector which conforms with international shock absorption standards. The knee protector features a highly efficient ventilation system and an outer fabric which is made with high-tenacity polyamide yarns for low friction and high abrasion resistance. VPD is the perfect material for mountain biking as it wraps around a riders body shape when warm, which gives great freedom of movement on a bike. To protect riders during a fall, the VPD technology then hardens on impact to help minimize injury. Extremely flexible and light VPD knee pad EN 1621-1 certified shock absorption Ventilation system constructed within each layer to optimize moisture management and comfort Low friction, polyamide construction with high abrasion resistance CERTIFIED EN 1621-1