From the tropics to the highlands, Columbia PFG Backcast™ Booney has got you covered. Nylon construction with polyester and elastane lining. Bucket hat closure. Combined with Omni-Heat™ thermal reflective layer. Moisture-wicking ability. 100% nylon. Hand wash, line dry. Imported. Product measurements were taken using size SM/MD (6 5/8-7). Please note that measurements may vary by size. Measurements: Circumference: 24 3⁄4 in Brim: 3 in View Zappos.com Glossary of Terms Columbia PFG Backcast™ Booney