Protect your head from the harmful rays with the Outdoor Research Bugout Sombriolet Bucket hat. SolarisShield construction offers UPF 50 protection from the sun. TransAction headband provides comfort and moisture management. UPF 50+ are made of UV-resistant fabrics and are constructed to protect you from the harmful effects of intense sunlight. Insect Shield fabric adheres permethrin to repel disease carrying insects like mosquitoes tickets flies chiggers ants and no-see-ums. The foam-stiffened brim floats in case you drop your hat into an accommodating river or lake. External drawcord adjustment in back for proper fit. Removable chin cord with cordlock holds hat in place on windy days. Materials: Shell: 86% nylon 14% polyester. Lining: 100% polyester. Imported. Measurements: Circumference: 24 in Brim: 2 3 4 in Product measurements were taken using size XL (7 5/8). Please note that measurements may vary by size.