Sponge Neoprene Foam Rubber Sheet with Adhesive, 12 in x 60 in x 1/2 in Multi-Function Soundproof High Density Waterproof Rubber Mat, Perfect Cosplay Easy Cut DIY Neoprene Padding Roll - Black:
BLACK NEOPRENE PLAIN SPONGE/FOAM RUBBER SHEET X 1.5MM - 25MM THICK VARIOUS SIZES | eBay