Durable 300 denier waterproof outer. Warm 220g of polyfill. Includes full wrap chest and belly closure. Large collar for extra protection. Highly visible color and reflective strips for added safety. To determine the correct size coat for your dog, measure from the base of the collar to the base of the trail. The measurement in inches corresponds to the dog coat size, which are sized in 2-inch increments. If your dog measures between sizes, size up if your dog is on the rounder or thicker side, and size down if he or she is thinner.