You can return icebreaker that you purchased directly from icebreaker.com as long as it is unworn, unwashed, and in the original packaging with tags attached. This may be returned for a refund for any reason within 30 days from the ship date.
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Underwear
Our fabric numbering system.
Choose your comfort level with our fabric weight numbering system. The numbers represent the fabric's weight in grams per meter2.
Our merino fiber measurement.
The diameter of a merino fiber is measured in microns – where one micron equals one millionth of a meter.
icebreaker’s merino fibers range from 15.5 – 23.5 microns to ensure a soft hand feel across our skin to outer layers. Finer fibers feel softer because they bend more easily when in contact with the skin.
The Siren is a lightweight next-to-skin layer. It’s crafted from 150gm merino jersey corespun fabric that’s lighter than most other fabrics we use, and is made with a snug, slim fit that works perfectly as a cosy piece beneath your other layers. Our Siren tees fit tighter than other tees in our range, just size up if you like a looser fit.
With Corespun we wrap our superfine merino fiber around a nylon core to create a durable fabric that retains icebreaker’s signature softness, odour resistance and performance.
Natural and ethical
Regulates body temperature
Naturally odor-resistant
Versatile, easy-care
