Easy to install and remove, Lock In™ReCaps are designed to fit the Pro Knee Pad and Pro Derby Pad. With minimal spacing between the cap and the pad, they are made of specially formulated materials they are durable and long lasting. Created specifically for the Pro Knee and Pro Derby pads. The new advanced Lock-In™ ReCap System closely contours the foam core and pad casing, greatly minimizing gaps between cap and pad. The new design sets a lower profile allowing for less bulk and optimum performance.