The minimalist unisex Mermel hat is a great functional piece made of quality material with an admixture of merino wool that 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 Perfectly wicks moisture away from the body Natural antibacterial property eliminates odours Main advantages: Excellent thermal insulation Elastic Please note that Merino is a natural material whose completely natural phenomenon is pilling, which therefore cannot be a reason for a later complaint about the product.