Treated with Insect Shield, the Sentinel Brim Hat from Outdoor Research helps protect against mosquitoes, ticks, and other biting insects. A wide brim, mesh vents, and lightweight fabric keep you covered and cool on adventures in hot climates. . Made from Supplex nylon fabric with UPF 30 sun protection. Insect Shield repels mosquitoes, ticks, ants, flies, chiggers, and no-se-ums, reducing the need for topical repellents. Insect Shield is odorless and EPA-registered; its effectiveness against insects is good for 70 washings. SolarShield construction: made of UV-resistant fabrics for maximum protection from exposure to intense sunlight. Foam-stiffened brim floats. TransAction headband for comfort and moisture management. Mesh side panels aid ventilation to keep you cool in hot climates. External drawcord adjustment. Removable chin cord with cord lock. Wide brim: 2.75 in. (7 cm)