A 1/2-inch foam padding is added to your rug between the hide and the backing making it softer to walk and lay on or adding a bit of depth when hung on the wall.
From The Natural World
Small Animal Taxidermy Forms at Foster Taxidermy Supply
Silver Falls Taxidermy
ALL - Matuska Taxidermy Supply Company – tagged Foam
Foam - Matuska Taxidermy Supply Company
Small Animal Taxidermy Forms at Foster Taxidermy Supply
Taxidermy Paxton Gate
ALL - Matuska Taxidermy Supply Company – tagged Foam
Premiere Taxidermy Services Orion Taxidermy & Safari Studio
3/4 Life Sized Mounts – Trevor-Gates-Taxidermy