2mm thick x 2mt x 1mt Self Adhesive Neoprene Sponge
Plain BLACK Rubber Foam Neoprene / EPDM Sheet Rubber Sheet Gym Flooring 1.2mm UK | eBay
Plain Closed Cell Sponge Foam Sheet - EdgeTrims
Neoprene Rubber Sheet - 1/8 Inch Thick x 4 Inch Wide x 10 Feet Long Neoprene Rubber Strips Rolls for DIY Gaskets, Pads, Seals, Crafts, Flooring, Cushioning of Anti-Vibration, Anti-Slip : Amazon.co.uk:
Neoprene Rubber Slabs | 30mm, 40mm, 50mm - The Rubber Company
RS PRO Black Rubber Sheet, 1m x 2m x 25mm - RS Components Vietnam