It's fabric, spray adhesive, a rubber rug backer. I folded over and hot glued the edges. I then applied two good coats of water-based satin poly. The result is a water-proof/ spill-proof kitchen accent rug that keeps my tile floor protected.
Anchor Grip 30 0.375" Felt and Rubber Rug Pad
x 18 ft. Non-Slip Synthetic Rubber Rug Pad
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Safavieh Grid Non-Slip Synthetic Rubber Rug Pad - x
Geometric felt & rubber carpet tiles.
Superior Lock 0.33" Felt and Rubber Rug Pad
Classic but beautiful - a Victorian terraced house's hallway. Plenty of these found all across the UK!
Martha Stewart Non-slip Hard Floor Rubber Rug Pad (3' x 5') (Set of 2) | Overstock.com Shopping - The Best Deals on Rug Pads
Found it at Wayfair - Rug Pro Ultra-Low Profile Felt and Rubber Rug Pad