The men's Meralp hat is a great functional piece made of high-quality material with a blend of merino wool, which will protect you from the cold and wind. Merino is a natural material suitable for allergy sufferers with a lot of great properties. Maintains body temperature It is perfectly breathable Excellently wicks moisture away from the body Natural antibacterial property eliminates odor. Please note that Merino is a natural material whose natural phenomenon is pilling, which therefore cannot be a reason for a later complaint about the product.