Megi Waterproof LED Flashing Dog Harness, Strong Nylon Webbing, Comfortable , Glowing Sparkling and Glistering Harness for Night Safety, Comfortable for Small Medium Large Dog and Other Pet Sizes are smaller than usual so please MEASURE YOUR PET before ordering LED light glows and flashes in darkness. Whether you walk your beloved dog at or after dusk or before dawn, the two of you will be vividly visible to traffic with one of this amazing glow and LED flashing lights dog harness. Also work as a decoration: let your dog more attractive. You get 60 hours of steady light, or over 100 hours of flashing light with each collar and leash set Size: S:Width 0.8", Dog Chest 11.8"-15"; M:Width 1", Dog Chest 14.1"-18.9"; L:Width 1", Dog Chest 16.5"-22.8"