The base of the protector is made of a very stretchable lycra sock. The Race series knee and elbow pads are not protectors as we usually know. They don´t feature any kind of foam paddings, because it will make the protector too thick and will hinder the athlete when fighting for the win in the race. It´s more like a sliding pad which is covered by high abrasion resistant kevlar material backed up with lycra to be comfortable to the skin. Silicone stripes hold the upper and lower band of the protector in place.