"K9 pursuits all seasons memory foam dog bed promotes three fantastic benefits. the Core and basis of the bed is high density memory foam which not only provides comfort but also relieves the pain of arthritis, joint and muscle stiffness. the K9 pursuits all seasons memory foam dog bed goes on to provide two functions. one side of the bed has a 100% cooling gel infused Memory foam layer for those Warm spring and hot summer months and to the other side, a layer of memory foam covered in thick, luxurious thermal Sherpa for autumn/winter when you pet can get cozy and stay warm and comfortable. the bed is then encapsulated with a removable flat style Zipped cover which is removable and machine washable/dryable. the K9 pursuits all seasons memory foam dog bed is available in three sizes - Small 29"" (74cm) x 19"" (48cm) x 4"" (10cm) - Medium 35"" (89cm) x 22"" (56cm) x 4"" (10cm) - large 40"" (101cm) x 26"" (66cm) x 4"" (10cm)."