Women’s base layer: The Smartwool W CLASSIC ALL-SEASON MERINO BL 1/4 ZB is suitable for all weather conditions and activities. The 100% Merino wool jersey fabric uses a nylon core to increase durability but is also comfortable and light as a feather. The stretch stitching is designed to increase comfort and your range of motion, while the curved seams are responsible for the great fit. In addition, the plant-based colours have flattering shades that make this sweatshirt more environmentally sustainable - simply has everything you need to face any challenge comfortably.