●【SIZE】M, head size: 14.6 inches(37CM), neck size: 10.6 inches(27CM); The neck girth and head girth measured by after the two flaps are buckled. ●【SIZE INSTRUCTION】: Please refer to the size information and take each measurement a bit loosely. When youre buying a hat, harness or some cool doggie fashion, youll want to make sure you measure your dog first. To properly measure your pet, please use a fabric tape measure. ●【Adjustable Rope】: Elastic adjustable rope with a spring buckle design can make dog hat keep in place and not easy to fall. ●【Durable & Windproof & Warm Material】: Dog aviator hat is made of PU leather+teddy cashmere which is durable that can provide a long time use and fantastic windproof function. Teddy cashmere is soft and comfortable, keep dog warm in cold winter. ●【Two Ways Wearing Design】: Dog hat with unique ear flaps can surround dog’s head by two buckles and it provides a vintage and fashionable look.