All our Aviator hats have leather tops and tie straps. We use the Best Quality of leather and fur to ensure years of rugged good looks and comfort.
Small - 21 1/2" - 21 7/8"
Medium - 22 1/4" - 22 5/8"
Large - 23" - 23 1/2"
XL - 23 7/8" - 24 1/2"
XXL - 24 1/2" - 25 7/8"
Most accurate way to measure is to wrap the measuring tape around the head and above the ears, meet in the middle of the forehead.