8'x11' 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. Rug Pads should be slightly smaller than rug. If your rug is not exactly 8'x11', we'll custom cut for free! See product description. Actual pad size 8' x11'.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.