The Bluegrass "Skinny D30” knee pads are made of polypropylene with a D30 core. Offers optimal flexibility but hardens immediately in the event of shocks and blows. They are ergonomically pre-shaped for a secure hold on the joint, guaranteeing optimum protection. The Vaportech Light Mesh wicks moisture away from the skin. The guided Velcro straps ensure a comfortable, friction-free fit and are additionally equipped with silicone to prevent slipping.