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    Chill, Out! 10 Top Base Layers

    By By Jeff Burke
    December 19, 2013, 6:11:55 AM EST

    Cotton may be the fabric of your life, but in the great outdoors—the great cold outdoors—it’ll ruin you. When natural cotton gets wet, it stays wet; and you get a chill. If you remain in a cold environment with wet clothes, chances are you’ll get hypothermia. It’s that simple. Prolonged exposure to cold isn’t fun. But if you have the right kind of base layer, namely merino wool and/or synthetic poly, you’ll not only enjoy the cold outdoors, but you’ll be safer. (And for the record, hypothermia can happen in above-freezing temperatures.)

    When synthetic athletic base layers came out decades ago, they wicked moisture away from the body and kept you dry. But it came with a price. While the fabric pulled sweat away from your skin, it left a stinky trail. I myself used to put my base layers into the freezer after washing to kill any remaining microbial stench. But a lot has changed since then, namely the proliferation of merino wool. This miracle fiber naturally prevents the buildup of microbial particles in the yarn fabric. And with the new treatments for synthetics—which prevent sweat particulates from attaching to the fibers—sweat has nothing to do but evaporate into the ether.

    Personal preference is an important factor when choosing wool over synthetic, or vice versa. Many winter sports enthusiasts choose merino for the next-to-skin softness, and because it retains heat when wet and doesn’t stink after repeated use (within reason).

    Synthetics, however, are also still popular because they can draw moisture away from the body. They also dry fast and can be very inexpensive compared to high-end Merino yarns.

    That said, many companies are now blending wool and synthetics such that the dual fabric not only pulls moisture away from the skin, it also dries more quickly while keeping some of its inherent heat retention. This means you’ll stay dry—and thus warmer—throughout longer high-output winter activities.

    Below are ten wool, synthetic and hybrid base layers that go the distance in the most arduous cold-weather climates. They also pass muster in stand-alone style for an afternoon at the library, coffee shop or bar.


    Mammut Go Warm Zip Long Sleeve

    Mammut’s Symbitech hybrid Go Warm combines poly microfibers and merino wool by body-mapping them to specific locations that conduct or lose the most heat. The trim athletic cut looks good as a stand-alone, or it’ll layer—your choice. And the angulated back hem eliminates plumber’s crack. $85

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    Marmot ThermalClime Pro CrewMarmot’s ThermalClime Pro Crew has a cool bi-component knit construction that aligns larger yarn fibers to draw sweat off the skin, passing moisture onto smaller fibers that quickly spread out for fast drying. The augmented evaporation process makes it a solid choice for extended days in backcountry huts. $50


    Icebreaker Oasis Crewe

    The pride of New Zealand, Icebreaker’s lightweight, sustainably sourced 100-percent merino has been the darling of many a wool aficionado. Super cozy next to skin, the Oasis Crewe is a savvy stand-alone winter shirt or a dependable base layer for any demanding winter adventure. The offset shoulder seams work well under a pack’s straps, and the angulated hem gives added coverage to the lower back. $90

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