An ultralight base layer designed to manage sweat during high-intensity activities, the men's Icebreaker 125 ZoneKnit Crewe top keeps you comfortable when you're moving fast.

base-layer-tops

An ultralight base layer designed to manage sweat during high-intensity activities, the women's Icebreaker 125 ZoneKnit Crewe top keeps you comfortable when you're moving fast.

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Crafted from breathable alpaca, the men's Arms of Andes 160 Ultralight Alpaca Wool long-sleeve shirt keeps you warm and dry during intense activities—no matter the season or climate.

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Crafted from breathable alpaca, the women's Arms of Andes 160 Ultralight Alpaca Wool long-sleeve shirt keeps you dry during intense activities. Wear it alone in summer or as an extra layer in winter.

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An all-seasons base layer, this men's Arms of Andes 300 Lightweight Alpaca Wool Half-Zip top is breathable for summer hikes and warm from the slopes to apres-ski in winter.

base-layer-tops

An odor-resistant, all-seasons base layer, this women's Arms of Andes 300 Lightweight Alpaca Wool Half-Zip top is breathable for summer hikes and warm from the slopes to apres-ski in winter.

base-layer-tops

Premium quality meets outstanding sports performance for the adventurous at heart. The women's Artilect Boulder 125 T-shirt is incredibly soft and holds its shape with an easy fit and no-chafe seams.

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A great top for any season, the Smartwool Classic All-Season Merino top wicks moisture and regulates temperature, making it ideal as a fall base layer or a single layer when summer backpacking calls.

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Layering is smart when you know the mercury will dip and rise on your hike. The Smartwool Merino base layer tee works well undercover on cool mornings or as a standalone piece in warmer temps.

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