InTheHouse Pet Dog Preserver Life Vest Jacket Aquatic Swimming Water Safety Material : Oxford Cloth Color : 6 Colors to choose XS - Back (20 cm), Chest (30-40 cm), Neck (17-25 cm); S - Back (25 cm), Chest (41-48 cm), Neck (30-38 cm); M - Back (30 cm), Chest (49-58 cm), Neck (30-43 cm); L - Back (35 cm), Chest (55-70 cm), Neck (38-43 cm); XL - Back (45 cm), Chest (72-95 cm), Neck (48-58 cm). Convenient top grab handle for easy resuce by hand or boat hook. Front float assists in keeping dog's head above water Adjustable nylon straps and quick-release buckles Please choose the size according to the size chart in product photos. And please understand that there is no standard sizing system for pet clothing. Please measure your pet and compare to the chart provided as each brand and style of pet clothing has its own sizing system.