The ErgoKneel Kneeling Mat can reduce knee trauma and lower-back stress. It's made of heavy, resilient, 1-inch thick closed-cell foam rubber. It hugs the floor, has beveled edges to prevent slips and trips, is non-corrosive and self-extinguishing, and won't absorb water. The product comes in three sizes—14" x 21", 16" x 28", and 18" x 36".