Our Pet Life Ruff Suede Shoes feature a full zipper and additional Velcro to lock and seal the zipper. Made of high quality suede, the shoes are fully supportive and great all year round. Features Thinsulate Insulation technology. Sizing instructions: Measure the sole of your pet"s foot - Length x Width (in inches): | X-Small: 2.4" x 1.5" | Small: 2.8" x 1.7" | Medium: 3.0" x 1.8" | Large: 3.4" x 2.0" | X-Large: 3.7" x 2.2"