For cold weather adventures in extreme environments, the Outdoor Research Men's Wind Warrior Hat offers superior protection. Made of GORE WINDSTOPPER Technical Fleece with a full fleece lining for additional warmth, the Wind Warrior protects against harsh winter winds. Integrated Polartec WindPro ear panels improve hearing.Features: Fabric Performance: Windproof, Wicking, Hybrid Mapped Construction Design Features: Contoured Earband, Four-Panel Crown Construction, Embroidered OR Logo Functional Details: Back Stretch Panel Adjusts to Fit Fabric: Crown and Earband: GORE WINDSTOPPER 3L 100% polyester microfleece Earports: Polartec Wind Pro 90% polyester, 10% spandex hard finish face with soft fleece backer Lining : Radiant Fleece 95% polyester, 5% spandex