The Bjorn Daehlie Mountain Wool Long-Sleeve Top is a versatile baselayer for our year-round workouts in a range of temperatures. This lightweight baselayer features a unique blend of Merino wool and Tencel lyocell that's not only comfortable but also regulates our temperature. Both fabrics feel soft against our skin and wick away moisture--while the merino wool is naturally odor-resistant to keep us feeling and smelling fresher. That combination works well most of the year for our moderate intensity activities such as hiking and snowshoeing or certain styles of downhill skiing and snowboarding.