Back on Track® Dog Mattress Cage Fit is rectangular and manufactured using the revolutionary Welltex™ ceramic infused fabric. Designed to reduce the pressure from your pet’s weight, the mattresses also ensure warmth and comfort while allowing the materials therapeutic FAR Infrared properties to maintain supple muscles & joints. If your pet is prone to any arthritic and/or joint conditions, these mattresses can provide great relief and improved mobility while being warm and cozy. Ideal for dogs with inflammatory conditions or for sporting dogs, the mattresses are an ideal substitute for a jacket/blanket. The "Cage Fit" has a thin and relatively solid fill. It is easily washable and is suitable for the car as well as all other dog sleeping quarters. Comes in a range of sizes (Extra Small, Small, Medium, Large, Extra Large).