Designed for severe kneeling conditions like cold/hard surfaces, steel, concrete, grating, gravel, wet surfaces, dirt and mud. Actively helps to reduce knee and lower back pain. Provides comfortable support and cushioning for both sitting and kneeling. Does not compress set and does not absorb liquids. Silicone-free, fully washable. Impervious to petroleum products. Resilient Closed cell PVC 1" foam rubber with built-in handle. Self extinguishing and non conductive.