A superlight cap you can pack in your backpack and wear when needed - it'll resume its form once you put it on again. - Stretch main fabric with great moisture control: 90% recycled polyester, 10% elastane - Temples with 94% recycled polyester and 6% elastane - Peak made of polyurethane - UPF 50 - Reflective detail - Rear size adjustment - Made in Spain The Buff factory has an ISO14001 environment certificate, and SGE 21 ethical and social responsibility certificate. Electricity used in production is made with renewable sources.