Built to fit, flex, and follow you like a shadow, the Smartwool Intraknit™ Thermal Merino Base Layer Bottom for women uses the innovative 3D knitting technology to create Smartwool's most insulated, ventilated, and flexible base layer bottoms ever. These women's wool pants feature Merino Sport yarn to offer the power of Merino paired with the durability and fast dry times of polyester — perfect for skiing, running, and all your high-intensity training.