Mountain Hardwear makes sure your head is covered for your next adventure. Wide-brim design for full coverage. Drawcord attachment under the chin for a customized fit. Cool.Q ZERO lining around forehead provides an all-day cooling sensation. Closed cell foam brim allows for easy packing and stays afloat in water. UPF 25 protection. Dark underbrim reduces glare. Body: 93% nylon, 7% elastane. Brim: 100% nylon. Lining: 92% polyester, 8% elastane. Hand wash cold, line dry. Imported. Measurements: Circumference: 21 in Brim: 4 in Product measurements were taken using size Regular (SM/MD 21 - 22 1/4). Please note that measurements may vary by size.