Ruffwear Bark'n Boot Liners will enhance the fit, upgrade the performance, and improve the comfort of your dog's boots. Designed with a tapered cuff to keep the boot liner in place and makes putting on dog boots a cinch! The curved "claw box" follows dog paw anatomy and minimizes bulk inside the boot. The comfortable shape is also ideal if your dog has a dew claw. The Bark'n Boot Liners are made out of 90% polypropylene and 10% spandex fibers that wick moisture, dry quickly, and provide comfort and stretch. Machine washable for quick and easy care at the end of the day.