Made with high density, thick nitrile rubber (NBR) closed cell foam rubber that will not compress over time, protecting knees against hard surfaces Lightweight and has a built-in handle making it easy to carry and transport and convenient to hang and store Water-resistant and petroleum-resistant construction make it perfect for everything from bath time to work in the garage Designed for kneeling on cold surfaces, hard steel, concrete, grating, gravel and wet surfaces Comfortable knee support without having to strap on work knee pads Helps protect against common knee injuries on the job by supporting knees and joints.