Merino wool is soft, breathable, inherently warm and has natural moisture management properties, and we went the extra mile to create a Merino wool blended with acrylic for the perfect warmth-to-weight ratio without any of the itch. Additionally, the fleece band lining serves as an extra layer of warmth and softness against your skin. Whether you’re snowshoeing, running, skiing or using this as an under helmet layer, it stands up to all activities and temperatures, all season long.