The Columbia Women's Glacial IV Half Zip Fleece is a versatile and cozy synthetic base layer top. Made with 100% polyester microfleece, it provides excellent insulation and warmth without adding bulk. The half-zip design allows for easy ventilation and temperature control. This top is perfect for layering under a jacket or wearing on its own during mild weather. With its soft and comfortable fabric, it is no surprise that it is one of the most wished-for women's synthetic base layer tops on Amazon.
