The Smartwool Women's Merino 250 Base Layer is a top-rated base layer set on Amazon for women. Made from 100% Merino wool, this base layer set provides excellent warmth and moisture-wicking properties. The fabric is soft, breathable, and odor-resistant, making it perfect for outdoor activities in cold weather. The set includes a long-sleeve crewneck top and a pair of leggings, both designed to fit comfortably under other clothing. With its superior insulation and comfort, this base layer set is a favorite among outdoor enthusiasts and athletes.