Synthetic Polyester Felt Sheet: 12 in W x 12 in L, 3/16 in Thick, Synthetic, Plain Backing, White

Synthetic polyester firm felt is commonly used for weatherstripping, pads, wipers, and packing.

https://www.grainger.com/product/Synthetic-Polyester-Felt-Sheet-795LK3?searchQuery=795LK3&searchBar=true&suggestConfigId=6