Bring Fido along on your water adventures and keep them safe in the O?Brien Pet Vest This PFD has nylon construction with flexibility and mobility in mind It has one buckle at the neck and two adjustable ladder locks strap wrap around their body for a snug and secure fit A reflective nylon grab handle with leash attachment makes it easy to pull them to safety Perfect when you?re boating enjoying a day at the beach or just cooling off in your backyard pool XS WEIGHT 8 15lbs/NECK 10? 13?/CHEST 18? 24? S WEIGHT 15 30lbs/NECK 12? 16?/CHEST 22? 28? M WEIGHT 30 60lbs/NECK 15? 19?/CHEST 26? 32? L WEIGHT 60 80lbs/NECK 18 22?/CHEST 30? 38? XL WEIGHT 80 lbs +/NECK 18? 24?/CHEST 30? 42?