Arctic Shield Winter Moss Dog Bed - The Arcticshield dog bed features Retain heat retention technology, a durable polyester outer shell, a durable nylon bottom with non-skid silicone texture, Sherpa fleece top and inner sides and soft and comfortable bed filling. Retain heat retention Durable polyester outer shell Sherpa fleece top and inner sides. Retain heat retention technology Durable polyester outer shell Durable nylon bottom with non-skid silicone texture Sherpa fleece top and inner sides Soft and comfortable bed filling Sizes Available Medium: 13in X 16in Inner Bed Area Large: 21in X 29in Inner Bad Area