This is the dog coat with a built-in patch that changes color when temperatures are too cold for your pet. The patch reacts to ambient temperature around your dog's body—alerting owners to extreme weather conditions. The coat has a waterproof polyester exterior to keep a pet dry in inclement weather and a faux fur lining to comfortably keep them warm. With a faux fur hood trim, pockets with a waste bag dispenser, and slots for collar/harness and leashes. A protective treatment helps inhibit bacteria, mold, mildew, and odors. Sizes XS (chest circumference 12-15", neck to tail length up to 10-11"), S (15-17", 11 1/2-13"), M (16-19", 13-15"), L (18-22", 16-18"), XL (22-26", 19-21").