The Helly Hansen Women's Lifa Merino Base Layer Top is a highly rated option for women's outdoor base layer tops. It is made with a blend of Merino wool and Lifa Stay Warm technology, providing excellent insulation and moisture-wicking properties. The fabric is also naturally odor-resistant, making it perfect for extended outdoor activities. The top has a slim fit that layers easily under other clothing and a crew neck design for added warmth. With its versatile performance and comfortable feel, this base layer top is perfect for a wide range of outdoor activities.