The TH5 Tilley Hemp Hat, designed with a medium brim, is made from a breathable hemp fabric that is naturally resistant to UV light, mould, mildew and salt water. Although the Hemp Hats have a soft linen-like look they have a 'tough as nails attitude'.Why Hemp? In fact, Hemp is the world's strongest natural fibre. It is breathable, and naturally resistant to UV light, mould, mildew and salt water. Tilley Hemp fabric has been tested and certified as having a UPF 50+; this is the maximum UV protection rating given.Features:Guaranteed for lifeInsured against lossExcellent sun protectionRepels rainSecret pocketTies on in the windMachine washable ( WON'T SHRINK)Material:Hemp with brass eyelets.The fabrics of all Tilley Hats have been certified to block 98% of harmful UVA/UVB radiation and deliver an ultraviolet factor (UPF) of 50+, the maximum rating is given.Brim Measurements (size 7 3/8):- Front: 2 5/8"- Back: 2 3/4"- Sides: 2 1/8"Size Assistance:54.5 cm = 6 7/855.5 cm = 756.5 cms = 7 1/8 - Average womans size *57.5 cms = 7 1/458.5 cms = 7 3/8 - Average mens size59.5 cms = 7 1/260.5 cms = 7 5/861.5 cms = 7 3/4 *62.5 cms = 7 7/863.5 cms = 864.5 cms = 8 +Care:Wash it frequently or non-removable sweat stains will mar it and possibly rot it. Machine wash on delicate cycle separately or hand wash in cool water. Do not use bleach as it remains inside the Hat, slowly rotting it. Smooth and reshape the Hat by hand and set it out to air dry. When the Hat is dry, simply re-stretch it, as an American sailor showed, by putting your knee in the crown, and pulling firmly on the opposite side. Tilley TH5 Hemp Hat | Olive