The RD Elite level Pro Blocker Knee Pads are made to protect when things get rough. The Pro Blacker Pads Features Elasto Max Comfort Sleeve with Elite D-Cell foam padding. Removable High Impact Caps, industrial Velcro and Velcro Straps keep the knee pads in place during movement and impact. To limit the danger of pad slippage, the Pro Blacker Knees have Silicone Strips on the top and bottom. The RD Elite Pro Blocker Knee Pads are made for the skateboarder, skater, or Derby Player who want to push the limits.