WAUDOG Relax dog beds are made of six cm thick polyurethane foam. It is a warm, airy material that keeps its shape. Each bed comes with removable spunbond mattress covers, which are made of Oxford fabric, durable and pleasant to the touch. They are easy to clean, and the waterproof bottom does not slip on the floor. The covers are sold separately so that the customer can choose several interchangeable designs for the bed.