The optimal wool blend super underwear for training at moderate intensity in all weather conditions. Active Wool is perfected for varied weather, as the Merino wool/Tencel™ blend effectively regulates your core temperature, keeping you well insulated when it's cold and cool when it's hot. This blend extends the durability of the garment and provides all the qualities that wool gives you, so it absorbs an impressive amount of moisture and maintains breathability. Tencel™ enhances the wool's already effective moisture transport during both activity and rest, so you stay dry throughout your session. Since we strive to create products with a reduced environmental footprint, Active Wool is so-called non-dye super underwear, which means that the production of Active Wool saves 3.5 liters of water per garment, so you get underwear with a lower environmental footprint. The flatlock seams ensure reduced rubbing. This long-sleeved top is optimal when you need to perform at your maximum potential without compromising on comfort, whatever the season.