The two most important benefits of any kneepad are protection and comfort. And nobody has more comfortable ways to protect more hard working knees than CLC. Each one built to last and built for comfort and protection. CLC Ultraflex Non-Skid Professional Kneepads have a sure-grip non-marring cap surface. High density, closed-cell foam inner pad for all-day-comfort. Super thick, high density closed cell foam for all day comfort. Soft, flexible outer shell protects and grips most surfaces without scratching or scuffing. Super-accordion, Ultraflex construction for comfort and protection. Durable rubber straps are adjustable to fit all sizes.