Women’s Smartwool Merino Wool 250 Base Layer Crew Size Large 100% Merino Wool Imported COLD WEATHER BASE LAYER. Increase your comfort level with this 100% Merino wool crew. Add one of our best base layers for cold weather to your winter wardrobe and experience the difference the next time you go skiing, hiking, climbing, or biking. SLIM FIT. Designed to meet the demands of outdoor adventuring, this slim fit crewneck shows off a slimming silhouette while offering unrestricted movement through the arms and chest. CLASSIC THERMAL MERINO. Ideal for cold-weather activities where warmth and breathability are crucial, this midweight fabric uses a 100% Merino wool construction that helps move moisture away from skin to keep you warm and dry. WHY MERINO WOOL? Thinner and softer than regular wool, it's easy to wear next to skin. Each fiber transports sweat away as a vapor, helps cancel out smells (we checked) and regulates body temperature, to keep you cool in summer and warm in winter. FUNCTIONAL FEATURES. Go far, feel good with thoughtful tech to keep you trekking comfortably — a back body seam wraps to the front for a body-enhancing fit while a flatlock seam construction minimizes chafing.