Milliard 4" Premium Orthopedic 100% Memory Foam Dog Bed + Anti-Microbial Removable Waterproof Non-slip Cover Milliard waterproof velour zippered cover protects the pad from liquids, bacteria, allergens, mold and dust mites for the ultimate dog bed protection. Cover has an ultra-soft velour surface with a secure non-slip bottom. Anti-Microbial and Waterproof Cover is machine washable for convenient and easy care. Cover measures 24in x 18in x 4in