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Our sun-protective Hiker's Hat is designed with an evaporative cooling insert, powered by HyperKewl, to help relieve heat stress during treks. A rear brim loop provides a place to securely clip your Hat in place when not in use. These unique features, plus all the usual Tilley Hat benefits make this the ultimate Hat for the trail. Look forward to: - Maximum sun protection - fabric is certified UPF 50+, the highest given - An abundance of shade - broad brim protects from both sun and rain - Keeping cool - the HyperKewl Evaporative cooling material absorbs and slowly releases water through evaporation to help 'super charge' the body’s natural cooling process - Brim size: Front and back: 3 1/2"; Sides: 2 1/2" - Under brim color: Khaki under brim is Olive. All other colors have the same under brim color as body of hat - Weight: 3.8oz / 108 grams - Fabric: Hat: 98 percent cotton; 2 percent spandex - lightweight, breathable, sueded for a soft touch & with some give for a comfort fit - HyperKewl Evaporative Insert: 100 percent polyester mesh on the outside; interior is 53 percent polymer fibres; 47 percent cellulose fibres - Care: Remove HyperKewl insert before washing hat. Machine wash hat in cool water, delicate cycle or hand wash; Reshape & air-dry. - How to use your HyperKewl Evaporative Insert: Soak the insert in cold water for up to 5 minutes – insert into the Hat. The airflow through the mesh panel will start the evaporative cooling process. The cooling insert is expected to provide temperatures that are approx. 10 to 15 degrees Fahrenheit cooler than ambient temperature depending on airflow. It will not feel like an air-conditionner on your head – it will super charge the evaporation process to help you feel comfortable on the trail. High humidity will diminish the fabric’s ability to evaporate water.