Our 3" pure natural rubber is covered with our removable organic cotton cover. Soft fleece fabric feels great and dark colors help hide stains or choose our Brown Chenille or our Brown/Natural Striped Chenille. Machine wash/dry cover. Rubber core offers great support for pets. Supports the bones of your pet so they are less likely to suffer joint pain later in life. Choose a 3" Firm Rubber Core or 3" of shredded rubber. (Shredded Rubber is single pillow that is 3" thick) No toxic chemicals like memory foam and soy based foams have.