100% Mulberry Silk. No dyes. This has been the BEST bedding for keeping coats from matting. Silk is antimicrobial, and hypoallergenic. Great for sensitive skin. Temperature wise it is SO great for dogs, as silk doesn't get too hot or too cold. Your pampered pooch needs one of these, and you do too!  Fits over a standard pillow, which fits well inside a crate. There is a hidden zipper to keep it securely on the pillow.  The silk is 25 momme -  a super heavy weight silk that can be machine washed and dried and holds up for years. This is a much heavier weight than you will find by buying a silk pillowcase on amazon - at a better price, and it holds up for years. It doesn't rip easily to nails or mild chewing/comfort sucking on the pillowcase. Buy two! One to spoil your dog with, and one for you - your hair and skin will thank you!