Men's Base Layers, Mountaineering Thermal Insulation

The essential building block in any layering system. Base layers provide breathability, warmth, moisture control, next-to-skin comfort and temperature regulation. Upgrade now.

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ZoneKnit™ Merino Insulated Long Sleeve Thermal Hoodie - Icebreaker

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Men's Baselayers, Thermal & Long Underwear by Patagonia

X-Bionic® High Performance Base Layers for Men – X-BIONIC