Build up the warmth with our Thermal Collection—made to keep things cozy, comfortable, and even stink-free thanks to earth-friendly ingredients and adventure-enhancing design. This women's alpaca wool baselayer top features a new and improved yarn blend to maximize durability and softness, while the updated slimmer fit makes it easy to layer. With flat coverstitches for no itching or irritating, raglan armholes for freedom of movement, and improved thumbholes for security and coverage, this isn't your average baselayer!