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When it comes to your first layer, comfort is as important as performance. And when it comes to comfort, Smartwool Women’s Merino 150 Lace Base Layer Long Sleeve checks all the boxes. The lightweight fabric is breathable, moves with you as you climb to new heights, and helps keep your temperature regulated. The added durability of Nylon means that—just like you—this Smartwool® base layer won't quit.