The key to staying warm in winter is staying dry--which is why we like the Smartwool Intraknit Merino Fleece Full-Zip Hoodie as a cold weather mid-layer. The blend of merino wool and fleece not only keeps us insulated in the cold but also wicks moisture and dries quickly when we run warm during high-output activities. The Intraknit weave also features body mapping insulation adding extra warmth where we need it while sneaking ventilating mesh under the arms to dump heat and moisture. The hoodie also encourages mobility with a regular cut that eliminates bulk and an articulated fit that frees our limbs to move freely as we're hiking snowshoeing skinning and cross country skiing.