The Ultra Paws Rugged Dog Boots protect your dog's feet from asphalt, gravel, rocks, cactus, hot pavement, snow, ice, mud, cold, sand burrs and thorns. These ergonomically designed dog boots have a rugged, flexible, super-grip sole and are guaranteed to stay on your dog's feet. They are easy to put on, with unique expanding side seams. Constructed of nylon wrapped with Reprotek (a material made from recycled tires), foam comfort pads, and 2 easy to adjust closures. These boots provide the best protection from the outdoors. Ideal for larger dogs. Manufacturer model #: 303OB. Ergonomically designed protection from the outdoors Boots stay on your dog's feet - guaranteed! Easy to put on, with unique expanding side seams Rugged, flexible, super-grip sole Ideal for larger dogs 2 easy to adjust closures Foam comfort pads keep boots in place To determine the best size boot for your dog, place your dog's foot on a piece of paper and press down. Measure the expanded width of the foot on the paper. If 2-1/2'' or less, choose a Small; if between 2-1/2'' to 2-3/4'', choose a Medium; if between 2-3/4'' and 3-1/4'', choose a Large; if your dog's foot measures between 3-1/4'' and 4'', choose an X-Large. Imported.