Boot upper is made of water resistant fabric, with warm and soft lining, very comfortable to paws, suitable for the dogs' daily walking and travel Skid-proof and flexible soles, capable to provide traction and protect dogs' paws from pavement, grass, tile, deck, boat, winter salt, snow, ice, indoor hardwood floors and other surfaces, also provide traction for dogs' walking or running Please measure dog's paws first before choosing the size, and size Medium: Inner Sole Length 2.56 in, Inner Sole Width 2.56 in; if the measurement falls between two sizes, opt for the smaller size to ensure a snug fit Bend the cuff down outward enough to place the paw inside the boot, and release it once positioned; then wrap the elastic strap around to avoid slipping One set contains 4 boots totally, and every boot is fastened by the elastic and adjustable strap, which is also reflective at night Size Medium: Inner Sole Length 2.56 inches, Inner Sole Width 2.56 inches, recommended for dogs weighing 51 to 85 lbs. Please measure your dog's paws first when the dog is standing naturally, as this is the most crucial step before choosing the size. One set contains 4 boots. Please bend the cuff down outward enough to place the paw inside the boot, and release it after positioning the paw fully inside; then fasten the adjustable strap around the boot to keep it in place. If the measurement falls between two sizes, select the smaller size to ensure a snug fit. While if you've chosen the larger one, you could kindly try to use socks for dog before putting on the boots and then the boots will stay on better. With soft lining, these dog boots are comfortable paw protectors for dogs, warm, flexible, lightweight, sturdy and hand washable, capable of protecting the paws indoors and outdoors.