The Body Warmer overall is a multi-purpose product suitable for an active dog's muscle care, and for providing extra warmth under a waterproof jacket or overall. It is also ideal for ageing dogs, and dogs undergoing rehabilitation. The foil material on the inner surface reflects the dog's body heat and provides extra warmth. Smooth and elastic material makes the overall very comfortable to wear. The overall has an adjustable belt and collar. Reflectors on the seams make the dog more visible in the dark. I bought this for my dog and it’s the wrong size, so I tried it on him but it’s never been used.