Layer up with the Arc'teryx Phase SL Bottoms and enjoy comfort and warmth during extended aerobic activity.

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Stay warm this winter with the Saxx Ultra Long John Bottom. Made with viscose from bamboo and stretchy spandex, this layering piece will help keep you and the boys toasty warm.

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The Ibex Woolies Bottom is a lightweight merino base layer for high-output sports.

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If you\222re in need of a lightweight baselayer, but don\222t want coverage down to your ankle, the Stoic Men\222s Merino 200 \276-Length Bottom is the one.

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It can get pretty dangerous to breathe in the vicinity of your base layer pants when youAAAre on a weeklong ski trip and there arenAAAt laundry opportunities. Try the Icebreaker MenAAAs BodyFit150 Leggings.

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I/O Merino's Contact 3/4 Length merino wool bottoms offer lightweight insulation from the cold and all of the comfort merino wool, but without competing for space in your already crowded ski, snowboard, mountaineering, and or combat boots.

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Wear the SmartWool Men's Microweight Bottom for temperate or warm-weather aerobic activities or as a next-to-skin base layer.

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Wear the Saxx Men's Pro Elite Long John Bottom to keep dry and comfortable the next time you are outside playing and the weather is less than perfect.

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The Icebreaker Men's BodyFit200 Legless Pant is a AA 3/4-length merino wool pant that's designed specifically for layering with winter boots.

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Get your legs into the Patagonia Merino 2 LW Bottoms when you need a versatile, insulating baselayer that will keep you warm and dry whether you're touring, trail running, or ice climbing.

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