Expedition Parka and Extreme Warmer have been designed to keep warm and protect your dog’s key muscle groups. Both jackets cover the legs, bum, and belly with waterproof surface material that is soft and comfortable.Expedition Parka is a perfect basic winter jacket which covers your dogs back and biggest muscles. The shell material of this jacket is made of very durable fabric.Extreme Warmer is the warmer jacket of the two as it has heat reflective foil lining, which gives significant additional warmth for the dog by reflecting the dog's body heat back. The jacket also has a hood which can be used to cover the dog’s ears. For dogs who get easily cold the Extreme Warmer would be a better choice because it offers better coverage than the Expedition Parka.