Icebreaker Siren Bra

$24.83Compared to $50.00* Save 50%
*Intermediate markdowns may have been taken.
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Color: Loden
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Made with a soft, durable merino blend to regulate body temperatures in all weather conditions, the Icebreaker Siren bra is lightly supportive and endlessly comfortable for easy everyday layering.


  • 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 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

Chest or Bust30 - 3232 - 3434 - 3737 - 4040 - 42

Sizing Notes

Measurements are stated in inches unless otherwise indicated.

366 reviews with an average rating of 4.4 out of 5 stars

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