The Cold Steel Beanie, made of 100% acrylic, is best hand-washed in cold water with a mild detergent. To protect the material, the beanie should not be washed in hot water, as heat can damage or stiffen the synthetic fibers. After washing, it should be reshaped and laid flat to air dry. The material is considered very durable, long-lasting, and weather-resistant, making it particularly suitable for cold conditions because acrylic retains heat well and is abrasion-resistant.