Altitude Crew Neck - Ultra Trail Edition

Base Layer
Availability: In stock
The Altitude Crew Neck is the perfect addition to any outdoor lover’s wardrobe and our all time best seller. This is one seriously good thermal layer, and it’s ready to keep you warm and comfortable no matter what your adventure.

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The Women's Altitude Crew Neck is the perfect ‘go to’ thermal layer for just about any adventure. A longstanding favourite within the ioRange and an all time best seller, the Altitude Base Layer is super lightweight and breathable, yet warm when you need it the most. Oh, and did we mention the incredibly soft next to skin feel? 

Made with our flagship Enigma MicroMerino® fabric – 96% superfine Australian Merino Wool and 4% Elastane - the Altitude Crew Neck Base Layer features all of the performance you know and love in our MicroMerino® garments, plus an easy four way stretch for freedom of movement when you’re on the go.

It’s the perfect thermal layer for core warmth when you’re layering up, yet versatile enough to be worn on its own in milder conditions. With flat lock seams, heat transferred tags and raglan sleeves to help prevent chafing, plus thumb loops and a drop back hem for easy layering, it’s the perfect combination of performance, warmth and comfort.  

Designed to be worn as a snug ‘contact fit’ layer, we’d recommend going up a size if you’re looking for a more casual fit. 

Key Features:

  • Made with the flagship Enigma MicroMerino® - 96% superfine Australian Merino and 4% Elastane - for an easy four way stretch and freedom of movement.
  • Drop back hem designed for tucking into your outer layers, or sitting over bottom layers, with no exposed cold spots when you're on the go.
  • Tag free, flat lock stitching and raglan sleeves to help eliminate chafe and maximize comfort.
  • Thumb loops to help keep your hands warm and stop your sleeves riding and bunching under your arms when layering.  
  • Ultra Trail Australia mandatory gear approved thermals

What you need to know:

  • Layering: Base Layer
  • Weight: Lightweight (170gsm)
  • Fit: Contact
  • Length: Drop back hem
  • 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


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.

You're reviewing: Altitude Crew Neck - Ultra Trail Edition

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

Model: Kat (Brunette)
Wears: Size Medium 
Height: 175cm / 5' 7"

Model: Breanna (Blonde)
Wears: Size Small 
Height: 181cm / 5' 9"

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