Lock-In™ ReCap: Designed specifically for Pro Knee and Pro Derby protectors. This new system adapts to the foam core and reduces the gap between the shell and the protector. The new design is less bulky to maximize performance. Lock-In™ ReCap System: A loop inside the shell secures it to the strap on the front of the protector. Velcro strips on the side provide additional grip. Two different sizes: Lock-In™ ReCaps are available in two sizes, C-1 and C-2, for a better fit and to reduce the protector's overall size.
 C-1: for knee pads in sizes XS and S
 C-2: for knee pads in sizes M, L and XL