Pet Life Shearling Duggz Paw Wear (features 3M Thinsulate): Blue, MediumOur Pet Life ® shearling "DUGGZ" shoes are truly a unique item. Fully covered with Sherpa & Suede. Your dog can now travel with real fashion in these comfortable shoes. These shoes also feature Thinsulate ® insulation inner lining. Keeping your Dog even warmer! Sizing Instructions: Please measure the Sole of your Pets Foot - Length x Width ("In" Inches): • Extra Small - 2.5x1.5" • Small - 2.8x1.7" • Medium 3.0x1.8" • Large - 3.4x2.0" • Extra Large - 3.7x2.2"