These rubber mats are equipped with special holes and gripped surface that allows moisture to drain through the surface of the mat, keeping interior floors clean and dry. ... The bubble-like shape of the mat helps relax the muscles on your foot and thus, gives a soothing effect to your tired feet. The "Bubble-Top" anti-fatigue mat is the ultimate choice for comfort and aesthetic. The surface of this cushion mat features protruding soft circular "bubbles" that help provide an enhanced degree of comfort for the feet standing on top of it.