Durable, Reversible 4' x 6' ULTRA HOLD(TM) Rug Pad for Hard Surfaces and Carpet ULTRA HOLD(TM) rug pad that is often imitated! Reversible non-slip rug pad designed for hard surfaces and carpet ULTRA HOLD(TM): Low VOC (meets or exceeds Carpet and Rug Institute Green Label low emission standards); Hypo-allergenic; Satisfies credit requirements for USGBC LEED Rating Systems ULTRA HOLD(TM): 45 ounces 100% Natural, Textured Rubber and 100% Recycled Felt ULTRA HOLD(TM): Safe for all floors. Guaranteed not to mark, stain, stick to or damage any hardwood, wood or hard floor ULTRA HOLD(TM): Extends the life of any area rug, prevents slipping, prevents floor damage, adds comfort and insulation.