Our Women's Intraknit Thermal Max Merino Base Layer 1/4 Zip. This bulk-free, 100% Merino wool thermal layer brings a new dimension to active winter wear. With seamlessly integrated insulation and ventilation, perfectly articulated flex zones, and Merino wool comfort, it'll be the first thing you grab when you need a warmer layer for your high-intensity, cold-weather adventures. | Smartwool Women's Intraknit Thermal Max Merino Base Layer 1/4 Zippers Top in Black | Size: Large