Smartwool's Women's Classic All-Season Merino Base Layer 1/4 Zip Neck is made for every day, season, and activity. Our All-Season-weight Merino jersey fabric uses a nylon core to increase durability while still keeping cozy 100% Merino wool next to skin. This women's base layer features stretch merrow stitching designed to elevate comfort and range of motion and princess seams for a figure-flattering fit. It has everything you need to go far and feel good.