Absolute Outdoor Onyx Neoprene Pet Vest small, 15-30#, neck 12-16-Inch, Chest 22-28-Inch, waist 18-24-Inch medium, 30-60#, neck 15-19-Inch, Chest 26-32-Inch, waist 22-28-Inch three adjustable body belts and quick release buckles for secure fit. designed to provide swimming endurance for your pet & security in the water neoprene construction for added comfort, warmth and durability reflective material on handler's strap for easy recovery & night visibility large, 60-80#, neck 18-22-Inch, Chest 30-38-Inch, waist 26-32-Inch. x-large, over 80#, neck 18-24-Inch, Chest 30-42-Inch, waist 26-36-Inch