Altitude Crew Neck 'Mongrel'

Base Layer
Availability: In stock

One of our favourite base layers just got a whole lot more adventurous. The Altitude ‘Mongrel’ has all the benefits of our superfine MicroMerino® base layers, but with a fun and colourful design, it’s the perfect way to stand out from the crowd and stay protected from whatever Mother Nature throws at you.

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We’ve affectionately named this one the ‘Mongrel’ because it’s made from a variety of the colours and patterns our customers have loved so much over the years. But don’t let the name or appearance fool you, this is still one seriously good base layer.

 The Mongrel is mostly made from our flagship Enigma MicroMerino® - 96% superfine Australian Merino and 4% Elastane for an easy four way stretch. There’s also a few different premium Merino fabric panels thrown in, but rest assured they’re all still super soft and comfortable. 

Look more than skin deep, and you can still expect the same level of natural breathability, temperature regulation, moisture wicking and odour-resistance you’ll find in the rest of our best-selling Altitude range.

Admittedly, the ‘Mongrel’ is not for the fainthearted, but then, if you’re out there getting up to all sorts of exciting adventures, you’re probably going to be the kind of person who’s more than happy to rock some colour. 

Key Features:

  • Made with a mix of premium Merino fabrics offering high performance and an incredibly soft next to skin feel.
  • Drop back hem designed for tucking into your outer layer, meaning that your skin is never exposed when bending or moving.
  • Thumb loops that stop your sleeves riding and bunching under your arms when layering.
  • Tag free, flat lock stitching and raglan sleeves eliminating chafing, maximizing comfort and next to skin contact.
  • Ultra Trail Australia mandatory gear approved

What you need to know:

  • Layering: Base layer
  • Weight: Lightweight (170 gsm)
  • Fit: Contact
  • Length: Drop back hem – extra length at the back 
  • Main Fabric: Enigma, 96% Merino & 4% Elastane, 100% pure Merino. Fabric Panels: 100% Merino, 96% 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.

You're reviewing: Altitude Crew Neck 'Mongrel'

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Measurements by inches and centimetres

Model: Daniel
Wears: Size Medium 
Height: 182cm / 5'9"

    S M L XL XXL
   Waist       Inches      28-30       32-34        36-38       40-42    44-46+
  cm  71-76  81-86 91-96 101-108 111-116+
Chest Inches 34-36 38-40 42-44 46-48 50+
  cm 86-91 96-101 106-111 116-121 127+