On the trails, on the water or in the city, the Columbia Coolhead Zero IV boonie hat will help protect you from sun and sweat. Made from a sweat-wicking fabric and providing sun protection, this wide-brim sun hat also features Omni-Freeze™ Zero sweat-activated cooling technology to keep you cool. The packable cape protects your neck from harmful rays in open fields, and the chin cord can be adjusted for a personalized fit.