Alto Hat is made in a fabric called Woolly Treemerino™, a Swedish made warm, stretchy and lightweight fabric in 60% merino wool and 40% Tencel®. Merino wool provides a natural warmth while the tencel fiber is made from cellulose, which gives the fabric structure and better moisture transmission. Thanks to the functional materials in Alto Hat, you can wear it both for outdoor sports like skiing or ice skating and for everyday warmth. If you are looking for a warm winter hat for everyday use or for winter sports, Alto Hat is a great choice.