The Women's Smartwool Classic Thermal Merino Base 3/4 Bottom is a base layer for skiing. The three-quarter length reduces the bulk inside your ski boots, allowing for a tall pair of (what should be Smartwool) ski socks in its place. The 100% Merino wool is naturally temperature-regulating, providing breathable comfort for long days on the groomed slopes or in the backcountry. Layer up like a boss and ski to your heart's content.