Made with certified organic cotton, blended with a touch of spandex. This medium brim Hat is super-soft, lightweight, and oh- so- comfortable. The ¾” mesh in crown enhances the breathability.Features:Excellent sun protection - Fabrics of all Tilley Hats are certified to block 98% of harmful UVA/UVB radiation and deliver an ultraviolet factor (UPF) of 50+, the maximum rating, although some rays could enter through the 3/4" mesh.Guaranteed for life not to wear out.Insured against loss for 2 years – all perils.Repels rain, floats and ties on in the wind.4-page Owner's Manual.Made in Canada.Weighs 3.5 ounces / 99 grams.Material:98% certified organic cotton; 2% SpandexThe 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 women's size *57.5 cms = 7 1/458.5 cms = 7 3/8 - Average men's 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 T5MO Organic Airflow Hat | Khaki