About This 【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 you're buying a hat, harness or some cool doggie fashion, you'll 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. Overview Size : Medium Neck Size : 10.6 inches Minimum Weight Recommendation : 5.5 Pounds Occasion : Birthday, Holiday, New Year, Thanksgiving Special Feature : Two-way wearing design, Elastic adjustable rope, Durable & windproof material