Size: Middle collar: 38-53cm, chest girth: 38-58cm, back length: 28cm. Material Premium Quality: Namsan dog life jacket has an inflatable insert design, the buoyancy is higher than normal foam and plastic dog vests on the market. Not only does it ensure your dog's safety, but it is also ideal for all your boating, sailing and other water sports activities with your dog Special Design: Namsan dog life jacket made of high visibility dye and reflective strips to keep your dog always in sight Comfortable Enough: adjustable velcro straps on the neck and belly to ensure a more comfortable size for your pets when wearing this dog life jacket, and let your dog swim on the water unhindered and quite comfortable Metal Button, Quick Release Buckles and Safety Handle: triple safety guarantee, wider and thicker handle on the back to make parents feel better when you take a long time to train your dogs or catch your dogs.