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Your favorite base layer is made with merino wool. Why shouldn't your bra be made with it, too? The Icebreaker Siren bra is lightly supportive and endlessly comfortable for easy everyday layering.

  • Features

    • Ultralight 150 g core-spun fabric is made with merino fibers wrapped around nylon cores for underwear that is durable and soft next to your skin
    • Merino is an annually renewable fiber that naturally resists odors, keeps you cool when it's hot and warm when it's not, and lets your skin breathe for comfort all day
    • This ZQ merino wool has been granted equivalency to the RWS (Responsible Wool Standard)
    • Space to insert bra cups
    • Modern fit also features thin, adjustable straps and no side seams
    • Inspired by nature, Icebreaker harnesses the performance qualities of natural fibers to offer an alternative to clothing based on petrochemical synthetics


    View all Icebreaker Women's Sports Bras
  • Technical Specs

    Best Use



    83% merino wool/12% nylon/5% elastane

    Bra Support

    Low Impact

    Support Style


    Strap Type

    Tank Top

    Adjustable Straps





    Wool certified to the Responsible Wool Standard (RWS)

  • Size Chart

    XS S M L XL
    Chest or Bust 30 - 32 32 - 34 34 - 37 37 - 40 40 - 42

    Sizing Notes

    Measurements are stated in inches unless otherwise indicated.

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