This is a high-performance dog floatation device for boating, water sport adventures and activities with dogs. Designed to protect your dog while allowing them to enjoy the water and provides and easy method of retrieving your dog from the water. Exceptionally durable materials that meet rigid safety specifications provide warmth and protection from abrasions.Our flotation jacket has an attachable chin float with a locking zipper Human flotation jackets keep your nose out of the water.Bright contrasting colors can be easily spotted in rough water. Size Information : Size X-small:chest girth 11.81"-15.75" , neck circumference 6.7"-9.84", back length 7.87" Size Small:chest girth 16.14"-18.9" , neck circumference 11.81"-14.96", back length 9.84" Size Medium:chest girth 19.69"-22.83" , neck circumference 11.81"-16.93", back length 11.81" Size Large:chest girth 21.65"-27.56" , neck circumference 14.96"-18.9", back length 13.78" Size X-large:chest girth 28.35"-37.4" , neck circumference 18.9"-22.83", back length 17.72" Please Note: Our sizes are manually measured, there may be little error ranging between 1 to 3 cm. Please choose the most suitable one for your dog. Thank you.