Columbia uses Omni-Freeze Zero fabric in this hat to create a cooling sensation. This fabric feels refreshingly cool on your skin, especially when damp with sweat. The Coolhead Booney provides sun protection with its classic wide brim. The fabric is made from fibers that naturally offer UPF 50 sun protection, meaning this is a permanent feature of the material rather than a treatment that wears off. It belongs to Columbia's "Omni-Shade Broad Spectrum" series, filtering a wide range of ultraviolet radiation wavelengths. The Coolhead Booney is an excellent choice for both land and water activities when spending long hours in the sun or traveling closer to the equator. Hikers, paddlers, photographers, and nature observers will appreciate this hats features on sunny days. - A generously sized neck flap can be easily folded into its own pocket when not needed - One size for adults ranges from 54 to 62.2 cm - Adjustable drawcord and chin strap - Breathable mesh panels on the si