This hat effectively protects against the wind and provides extra warmth in cold weather. [Material] This hat features a double-layer design, consisting of a durable acrylic outer layer and a comfortable lining. It is soft, lightweight, and gentle on the skin. The fleece lining effectively blocks the wind and provides extra warmth in cold weather. [One Size Fits All] Thanks to its excellent elasticity, it fits most head sizes (52 cm ~ 59 cm / 20.5" ~ 23.2"). You can easily adjust the size to your head circumference. Furthermore, the hat is lightweight and provides warmth without putting pressure on the head. [Versatile] Thanks to its semi-closed design, the hat can be used as a ski mask, neck warmer, or scarf. Additionally, the flap effectively prevents cold wind from entering. [Suitable for All Occasions] This thick knit winter hat covers your ears, neck, and most of your cheeks for extra warmth. Perfect for outdoor sports such as skiing, snowboarding, running, hiking, camping, cycling, fishing, and much more. [Washing Instructions] Avoid machine washing or brushing (to prevent pilling); avoid chlorine bleaching; hand washing is recommended; and dry in the shade.