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