BINGPET BB5004 Polka Dot Soft Vest Dog Puppy Pet Harness Adjustable - Blue Bingpet harnesses provide owners with a secure, comfortable, and controlled way to walk their pets Soft Air-mesh harness comfortable for any dog Made of 100% Polyester also very light weight with velcro and plastic clip closure and two heavy duty D-rings for added security. Quick release buckle & adjustable chest belt.You will love these vests. Medium:Chest Size: 14 - 15 inches / 11 inches Neck Girth.The velcro strap will adjust about 0.5 to 1 inches.Please measure your pet as attached picture.And double check the size before order.If The size in the border of end,advise you choose the up one. IMPORTANT:Please do not purchase the harness based on the size of another manufacturer/designer.You have to take various measurements into consideration before you purchase this harness.