No straps, no zippers, just 100% natural rubber that's designed to easily fit on your dog's paw and stay on. It bends and moves with your dog like a sock, and since there's no padding, your dog can feel the ground, making him more secure. Provides protection against ice and snow, salt, lawn chemicals, sand and hot pavement, but you can also pull it over a medical bandage to protect rashes or post-surgical sites. Reusable and disposable, each boot lasts many times - which is good, because your dog will love wearing them! Medium is for paws to 3", Large is for paws to 4". Includes 12 boots (6 pairs) per pack.