Build your layering system with Smartwool merino base layers, underwear and low-profile socks. Explore men's and women's tops alongside men's bottoms and boxer briefs for your outdoor and everyday wardrobe.
Find your next-to-skin layer
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Midweight tops: Men's and women's NTS Mid 250 crew tops and men's quarter-zip tops feature 100% merino wool interlock fabric. Compare necklines, patterns and fit details to choose your layer.
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Lighter base-layer bottoms: Men's Merino 150 bottoms use an 87% merino wool and 13% nylon blend, with a slim fit, functional fly and flatlock seams.
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Underwear: Explore the men's Merino Sport 250 Wind Boxer Brief. Check the individual listing for sizing and construction details.
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No-show socks: Men's casual no-show socks use a wool, nylon and elastane blend, with an internal heel gripper and supportive arch brace for low-profile shoes.
Fabric composition, weight and fit vary by style. Check each listing's size chart and available options, and follow the garment's care label when washing and drying.
