Womens Zodiac Brief Thermal Merino Wool Underwear

Zodiac Boy Brief

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The superior comfort of the Zodiac Boy Brief is unmatched. Enjoy the hipster fit, full seat coverage that stays put, never gathering or moving, ensuring a comfortable fit all day long.

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Some people completely overlook underwear as the foundation of layering. Big mistake. If you haven't already tried our MicroMerino® women's briefs, you're well and truly missing out. Rest assured, they're every bit as soft, lightweight, warm and comfortable as the rest of our high performance thermal layers. 

Made with our flagship MicroMerino® fabric - 96% superfine Australian Merino wool and 4% Elastane - these undies offer an easy four way stretch for extra comfort and freedom of movement, plus flat lock seams and a soft elasticated waist band. 

They're naturally temperature regulating, breathable and moisture wicking for year round comfort. Perfect for all of your travelling, running, hiking, skiing, snowboarding, climbing, cycling adventures, and whatever else it is you get up to in the outdoors!

Key features:

  • The ioMerino flagship ‘Enigma’ fabric. The composition of 96% Australian Merino wool and 4% Elastane to provide a four way stretch for easy movement.
  • Soft flexible ioMerino elasticated waist band
  • Tag free and with anti-chafe flat-lock seams
  • Superior 18.5 micron soft and lightweight Micromerino® provides a luxurious next to skin feel

What you need to know:

  • Layering: Base layer
  • Weight: Lightweight (160gsm)
  • Fit: Contact
  • Length: Underwear
  • Fabric: Enigma – 96% superfine Australian Merino, 4% Elastane

Natural MicroMerino® benefits:

  • Naturally breathable and temperature regulating. Helps keep you warm when it’s cool and cool when it’s warm.
  • Moisture Wicking. Stays warm even when it’s wet and naturally wicks moisture away from the skin for extra comfort.
  • Odor-Resistant. Natural antimicrobial properties to prevent odor – especially good for travelling and extended adventures.
  • Made with only the softest, finest Australian Merino wool. Designed and knitted in Australia for adventure.
  • An ethically and sustainably produced natural fibre. Good for the people who make it. Good for the planet.


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The ioMerino 'Enigma' is our flagship fabric. Featured in our Altitude range. 

'Enigma' is a lightweight 170gsm single jersey MicroMerino®, knitted using 18.5 micron 96% full-fleece Australian Merino wool knitted and 4% elastane.

The combination of merino wool and 4% elastin in the 'Enigma' fabric ensure perfect body contact, eliminates excessive bulk, and a 4-way stretch allowing your limbs to move freely as the fabric does not inhibit your range of motion.

Benefits of the ioMerino 'Enigma' fabric:

  • Moisture management wicking - moving moisture away from the body keeping the body dry and cool
  • Antimicrobial - Moisture absorption properties reduce the tendencies for a build-up of odour.
  • Luxuriously soft next to skin
  • Breathable and temperature regulating
  • Ultra-comfortable warmth
  • Maximum warmth, minimal weight
  • Quick drying

All ioMerino fabrics are fully machine-washable.

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    Best merino undies

    Review by CL on 1/12/18
    Fit well and don’t ride up. Much better quality than some other merino fabrics that seem to fall into holes after a couple of washes.

You're reviewing: Zodiac Boy Brief

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Sizing given in Australia, UK, American, and European standard sizes

Model Wears: Size Small

Australian 6-8 8-10 10-12 12-14 14-16
US 2-4 4-6 6-8 8-10 10-12
European 34-36 36-38 38- 40 40-42 42-44


XS inches 29.5–32.5 23.5–26 33–35.5
cm 75-82.5 60-66 83.5-90
S inches 32.5–35.5 26–29 35.5–38.5
cm 82.5-90 66-73.5 90-97.5
M inches 35.5–38 29–31.5 38.5–41
cm 90-96.5 73.5-80 97.5-104
L inches 38–41 31.5–34.5 41–44
cm 96.5-104 80-87.5 104 -111.5
XL inches 41–44.5 34.5–38.5 44–47
cm 104-113 87.5-94.5 111.5-119.5
XXL inches 44.5–48.5 38.5–42.5 47–50
cm 113-123 97.5-108 119-127