MATERIAL & SIZE: Made of Oxford cloth, durable to use. Size M: length: 12.2inches, width: 6.6inches, chest: within 9.8-15.7inches, leg spacing: 3.9inches. FRONT LEGS OUT BACKPACK: Front backpack is easier for you to take care of your pet. Head and legs out design, to hold the whole pet and let your pet enjoy a soothing stroll while keeping your hands free. BREATHABLE: Breathable oxford material to keep your dog comfortable. Two mesh side panels allow maximum air circulation. PREFECT DESIGN: There are two Velcro on both side, you can adjust according your pet’s size. Zipper and elastic openings allow you to fit your dog inside comfortably. Built in safety buckle, you can attach to collar to prevent dog jump out. HOW TO WEAR: 1. Pull the zipper on both side. 2. Put the dog's foot in the hole. 3. Pull up the zipper, attach the Velcro, and fasten the belt.