REI Co-op Active Thong Underwear - Women's

Color: Mulberry Taupe
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Members get an estimated 10% back on this item as a part of your annual .

Members get an estimated 10% back on this item.
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Stand up to sweat in the buttery soft REI Co-op Active Thong underwear. It wicks away moisture and is antimicrobial for hiking, running and days where the sun is your only guiding light.

  • Features

    • Stretchy polyester mesh is constructed with barely-there seams and trim details to keep you active and comfy
    • Moisture-wicking and quick-drying for a fast recovery after sweating—and washing
    • Antimicrobial treatment reduces odor buildup in the fabric
    • Pairs with REI Co-op Active bralette (not included)


    View all REI Co-op Women's Briefs
  • Technical Specs

    Best Use


    Underwear Style



    86% polyester/14% spandex mesh

    Moisture Wicking


    Quick Drying




  • Size Chart

    Numerical Size000-24-68-1012-14161820-2224-2602468101214161820222426
    Sleeve Length29.53030.53131.532.533.533.534.5303030.530.5313131.531.532.533.533.533.534.534.5

    Sizing Notes

    Measurements are stated in inches unless otherwise indicated. Some women's pants are available in petite and tall sizes. Typically petite sizes fit women 4'11" to 5'3".

    Regular sizes fit women 5'4" to 5'8". Tall sizes fit women 5'9" to 5'11".

    PETITE: Generally, as compared to regular sizes, petite sizes are 2.5 inches shorter in inseam,

    1 inch shorter in body length, 1.25 inches shorter in sleeve length and ¾ inch shorter in total rise.

    TALL: tall sizes are 3 inches longer in inseam, 2 inches longer in body length,

    2.5 inches longer in sleeve length and 1.25 inches longer in total rise. Capri or cropped pants have an intentionally shorter inseam—reference the technical specs instead of this chart.

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