CoverGrip drop cloths are manufactured with thousands of tiny, rubberized dots firmly attached to the bottom of each protective cloth. These dots are slightly rounded, which is what makes them so effective. There's nothing in the dots themselves that causes them to stick to a slippery floor, so the cloth can be repositioned with ease when needed. But once pressure is applied, the rubber dots grab and hold firm. And because they're rounded, the dots continue to hold, gripping tight even when under a shifting load. The aligned rows of dots also enable CoverGrip drop cloths to easily fold and conform to surfaces like stairs or fit snugly into corners. CoverGrip drop cloths can be machine washed without the dots falling off and are available in a variety of convenient sizes. 3 1/2 foot X 4 foot project cloth. CoverGrip