Order a replacement cover to have on hand when your dog bed cover is in the wash or when you want a new look. Tough Chew&174; fabric, developed exclusively by Orvis, incorporates an outer fabric in a ripstop weave of incredibly durable 1, 000-denier nylon, & an inner layer of rugged 840-denier nylon. If your dog chews through it, we'll refund your money. No questions asked. Flocked microfibre surface; solid brass zip.