this is a SPLIT hide the thickness is between 1

Lining: Omni-Heat Reflective™ 210T taffeta 100% polyester

Hydrophobic webbing straps stay dry

Saltwater Friendly Non-Corrosive Materials

Suede Upper

Muskrat Fur Aviator Hat Handicrafts this is a SPLIT hideAll 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. **LEATHER IS A VERY DARK BROWN, ALMOST BLACK** 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.