Pro Derby Knee Pads - Black / Black (SMALL) Designed Specifically for Roller Derby - Low Profile and less bulk with high level protection 187 Lock In Core System w/ removable foam allows for easy washing V-22 Dual Density Foam - specially formulated to provide the perfect combination of cushion and protection for multiple hard impacts Rapid FLEX Hinge - allows pad to respond freely to full range of motion; straighten or bend leg with little or no resistance Proven 187 Killer Pads Design Elements - Light-weight fast drying interior lining, seamless interior finish for ultimate comfort, ballistic nylon with industrial-weight stitching ensures durability, three-Panel construction for reliable performance, open back design for excellent fit and quick on/off