Ruffwear Bark N Boot Liners. These liners are a need when you have Ruffwear boots! These liners will enhance the fit upgrade the performance and improve the comfort of dog boots. Made with added stretch and a tight fitting cuff these liners will comfortably stay in place. We highly recommend trimming your dog's nails to help extend the life of the boot liners. Not to be used without dog boots. Comes in a set of 4 liners. Features: -Wicks moisture away from the paws in warm conditions -Dry quickly -Curved "claw box" minimizes boot bulk -90% Polypropylene 10% Spandex -Machine washable in cold water; air dry Sizing: <b>1.5_1.75</b>: Paw Width 1.5-1.75 in. (38-44mm.) <b>2.0_2.25</b>: Paw Width 2-2.25 in. (51-57 mm.) <b>2.5_2.75</b>: Paw Width 2.5-2.75 in. (64-70 mm.) <b>3.0_3.25</b>: Paw Width 3-3.25in (76-83 mm.)