Acrylic,Wool.High-quality thermal insulation material: Linner-authentic 3M Thinsulate, Shell-100% high-quality acrylic fiber, extremely comfortable and soft. It has excellent heat collection performance, which provides maximum warmth, durability and the warmest winter hat.Classic fashion design style: stable black, dark blue, star orange, beautiful and stylish design, can be matched with other formal and casual clothes.3.One size is suitable for everyone: 22.8 inches in circumference, comfortable and warm, flexible, adapt to various head shapes, the hat can be curled down to protect our ears from freezing, suitable for most women and men.A versatile hat: Not only does it have a stylish look, it is also perfect for skiing, running, skating, cycling, hiking or any winter outdoor sport.Exquisite gift ideas: This hat is perfect for all occasions, parties and outdoor activities. It can protect the head from cold wind in cold weather, ensuring you the maximum warmth. You can also show it to relatives or friends and it will be a great gift.