Size Extra Large. Engineered to provide traction for dogs without impeding their natural movement. Paw Pads™ are excellent for both active and senior pets. Slip-Not™ is a ultra thin neoprene fabric that provides excellent traction on hardwood, tile, marble or vinyl floors or any slippery surfaces. Ideal for older dogs with hip dysplasia and arthritis. Or dogs recuperating from hip or back surgery. Lightweight, breathable, water and chemical resistant. Non-toxic, hypoallergenic, medical grade adhesive. 40 Pieces Per Package.