Keep sunburn from spoiling your fun in the sun thanks to the Outdoor Research Helios Sun Hat. Ripstop nylon fabric increases the durability of the Helios and resists gnarly wear and tear. UPF 50+ SolarShield™ sun protection. TransAction™ headband wicks away moisture and feels soft against your skin. 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. 23" circumference. 86% nylon, 14% polyester. Wash cold and dry flat. Imported. WARNING California's Proposition 65 Product measurements were taken using size XL (7 5/8). Please note that measurements may vary by size. Measurements: Circumference: 25 1⁄2 in Brim: 2 1⁄2 in View Zappos.com Glossary of Terms Outdoor Research Helios Sun Hat