5'x8' MSM Duo-Lock Reversible Felt and Rubber Rug Pad for Hard Floors, Carpet - Includes RPFL (TM) Rug and Pad Care Guide Duo-Lock is a needle punched felt surface with a textured rubber lower surface to prevent slipping. Non-slip for all rugs and all hard floors. Reversible to keep rugs flat on carpet. Duo-Lock does not mark or stain floors. Actual pad size 5' x 8'. Duo-Lock can be trimmed with scissors if necessary. Contributes to LEED for a greener environment with no chemicals that out gas. Duo-Lock is Made in the USA - .25 inches thick. Mold, mildew and moth resistant.