For a lightweight and breathable base layer top, look no further than the Columbia Women's Glacial IV Half Zip Fleece. This top is made with soft and cozy microfleece fabric that provides warmth without adding bulk. The half-zip design allows for easy ventilation and temperature control. It features a flattering fit and comes in a variety of colors to suit your style. Whether you're layering it under a jacket or wearing it on its own, this base layer top is perfect for chilly days and outdoor activities.