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 a tape measure around the head, above the ears and meet in the middle of the forehead.