Hatch NK45 Centurion Neoprene Knee Pads, Black, One Size Feature shock-absorbing foam and second layer of polyurethane foam Strategically placed Eastex Slip-Not material provides excellent grip and extends wear Flexible fit, for long term wear Padding consists of shock-absorbing 10mm foam and a second layer of polyurethane foam, covered by a durable nylon laminated neoprene outer layer Strategically placed Eastex Slip-Not material provides excellent grip and extends wear Hook and loop elastic closures provide a comfortable and secure fit