The Columbia Women's Glacial IV Half Zip Fleece is a popular choice for women looking for a versatile and cozy synthetic base layer top. Made from soft and lightweight microfleece, this top provides excellent insulation and breathability. The half-zip design allows for easy temperature regulation, and the mock neck collar adds extra warmth. Whether you're hiking, skiing, or simply running errands in chilly weather, this base layer top will keep you comfortable and stylish.