This super stylish and practical winter coat is designed as a 'step-in' model that zips up in the back and has a built-in harness. That way you don't have to put multiple layers on your dog. It doesn't get any easier when going for walkies in the cold weather! The harness is adjustable and can be tightened or loosened to achieve the perfect fit. The jacket is made of waterproof material. Size guide: Size. Chest circumfrence cm Back length cm Approx. weight in kg 1 32-37 35 <4kg 2 38-44 40 4-6kg 3 45-49 42 6.5-9 kg 4 50-56 46 9-12 kg