BINGPET Dog Cooling Jacket Evaporative Swamp Cooler Vest Reflective Safety Pet Hunting Harness, Green Medium Size M fits a girth size between 16.9 to 22 Inch and a neck size 12.9 to 14.9 Inch,body length 14.9 inch Made from high quality PVA, air mesh panel, lightweight and breathable, soft touch . Side release buckles are easy to adjust, reflective band add the security when your dog walk at night. Utilizes evaporation,cooling and heat reflection to keep your dog cool in the summer. Carrying a bottle of water to drizzle on your dog when going for a long hike or walk. It makes for a happy owner and a very happy dog!