The Durable sole is pliable, super grippy, and ideal to prevent slipping on floors and light duty outdoors - plus they stay on your dog's paws! Packaged four boots to a set, in red or black, in six sizes. Wide opening split seam top - making it easy to put on the boots. Two Velcro straps with slides fasten the boots in place. Generous foam pads at the closures create a secure grip and cushions the dog's paw when the boot is tightened. Durable boots are the BEST protection for senior dogs or ones with hip conditions that are having trouble slipping on hardwood or tile floors. (Limited breathability; for extended periods of time in boots, use Ultra Paws Traction fleece dog boots). Tough, water resistant polyester material with the top of the toe and sole wrapped in a grippy, flexible, skid resistant, durable PVC or TPU (on two smallest sizes) sole. (For abrasive surfaces we recommend the Ultra Paws Rugged dog boots). The sole performs in wet and dry, hot and cold conditions. To extend the life of your dog boots we recommend applying Shoe Goo or a similar product to patch small holes in the sole that can appear with wear. To care for the boots, loosely fasten Velcro closure, wash in cold water delicate cycle; hang to air dry. If your dog is in between sizes, or for added warmth, we recommend a Doggie Sock. (U.S. Patent 7,971,557, Canadian Patent 2,486,628, Other Patents pending). To measure the width of your dog's foot, place the foot on a piece of paper and press down on the top of the foot, mimicking how the foot spreads when the dog's walking. Compare this to the boot sizes. the foot should be smaller than the boot size. Mark the left and the right side of the foot on the paper and measure the distance between the marks. Compare this to the boot sizes. The width of the foot should be smaller than the boot size. For example, if the foot width is 2 1/2 inches, order an Small at 2 3/4 inches.