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Smartwool took their popular all-season merino base layer and added a 1/4 zip to it. This Smartwool base layer is amazingly versatile and perfect for unpredictable weather—working as a single layer when it's warm out and the perfect start for more layers when the sun begins to hide behind the clouds. With Raglan sleeves and a flatlock seam construction designed to minimize chafing, you'll be able to rely on constant comfort all day long.
Formerly known as the Merino 150 Base Layer 1/4 Zip. Packaging may have either name but the product is identical.