The Pet Life Ruff Tough Suede Dog Shoe Sneakers are composed of a Tougher Suede Outer shell and inner lined with Thinsulate insulation. Features a Back Zipper and Double Wrap Around Velcro for Easy On Off access and added support and comfort. These Dog Shoes offer a higher level of ankle support. Features Rubberized Grips. These Shoes are essential during the Colder and Hotter weather climates protecting your dogs paws by helping prevent Frostbite and Protects your Dogs Paws against the Hot Asphalt. Essential for Dogs in Recovery and especially elder dogs and puppies. Sizing Instructions: Measure the Sole of your Pets Foot - Length x Width (inches): XS: 2.15 x 1.51 SM: 2.28 x 1.61 MD: 2.46 x 1.87 LG: 2.64 x 2.01 XL: 2.81 x 2.13