The All New Demon Hyper Knee V4 Heavy Duty delivers some serious benefits featuring a Kevlar front shield, D3O P Range Knee pad, and a form fit that is straight sick. Also, features double-bound stitching throughout the pad making it extra durable. The V4 is lighter, more comfortable and better fitting utilizing the P Range D3O, hyper perforated materials and a comfort velcro strap. Try it on and you'll never take it off. Hand Wash, Air dry. The Heavy Duty Knee has a removable Hard cap front- perfect for keeping your knees away from concrete and rocks. Worn out, or broken front cap? They can be easily replaced!