Womens Vital Base Layer Merino Wool Thermals Womens Vital Base Layer Merino Wool Thermals Womens Vital Base Layer Merino Wool Thermals

Vital Crew Neck

Second Skin
Availability: In stock

The Vital Long Sleeve is arguably one of the softest Merino second skin layers on the planet. Made with a unique 100% pure superfine MicroMerino® fabric with a ribbed texture to trap warmth and wick moisture you’ll feel warm, comfortable and fresh. Always. This one well and truly takes performance layers to another level and perfectly demonstrates what our superfine MicroMerino® clothing has to offer.

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If you’re looking for a luxurious next to skin feel, look no more as the Vital will totally change the way you feel about Merino wool layers. Even if you’re already a Merino convert, the unique MicroMerino® fabric used in this top takes comfort to a whole new level. In fact, if you can find a softer, smoother, Merino top anywhere, we’d like to know about it!

This top delivers all the warmth, comfort, temperature regulation, breathability and odor resistance Merino is famous for, but with the added benefit of being unbelievably silky smooth and soft. It’s also super versatile so whether you’re going for a run on a super cold morning, hitting the back country, bagging peaks or even doing what you do in milder temperatures, we promise this top will put a smile on your face.

The ribbed texture in the Kryptos MicroMerino® fabric the Vital is made from creates tiny air pockets at both the skin and interlayers to help trap warmth and keep you warmer than you would ever believe possible from a top this thin and lightweight.

If you’ve ever steered clear of Merino because you didn’t believe it could be comfortable enough, or if you’ve tried other brands and been disappointed, this is the top that will make you 'ReThink Wool’. If ever there was a pure, natural Merino thermal top suitable for people with sensitive skin or allergies, this would be it.

As if the fabric alone wasn’t already delivering ridiculously high levels of comfort, we've made this one with flat-lock seams and flat transfer tags for ultimate comfort, and extra length so you’ll stay tucked in and warm no matter how active you are. Even if you’re doing one of those really bendy yoga poses!

ioTip: The Vital has a ‘next to skin’ fit and is body hugging so if you don’t want a full contact fit, we’d recommend going up a size. Layer the Altitude Long Sleeve over the top of the Vital Long Sleeve for the perfect layering system and maximum heat retention.

Key Features:

  • ioMerino ‘Kryptos’ MicroMerino® fabric
  • Ribbed texture for extra insulation
  • Superior super 18.5 microns
  • Tag free for scratch-free comfort
  • Anti-chafe, flat-lock seams
  • Ultra Trail Australia mandatory gear approved thermals

What you need to know:

  • Layering: Next to skin
  • Weight: Super lightweight (155gsm)
  • Fit: Contact
  • Length: Top-of-thigh
  • Fabric: Kryptos - 100% Merino

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.
Vital V Neck

Vital V Neck

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Vital Tank

Vital Tank



The ioMerino 'Kryptos' is a 2x1 ribbed fabric. Featured in our superior base layer Vital Collection

The ‘Kryptos’ fabric is a ultra-lightweight 155gsm MicroMerino®  rib texture fabric, knitted used 18.5 micron full-fleece 100% full-fleece Australian Merino wool.

This fabric incredibly breathable and lightweight, and has a natural two way stretch.

The rib of the fabric creates air-pockets at both the skin and interlayer levels to help keep the wearer warm, yet the fabric allows moisture to be wicked away from the skin helping to keep you cool when then temperatures rise.

Perfect for both hot and cold temperatures

Benefits of the ioMerino 'Kryptos' 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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Sizing given in Australia, UK, American, and European standard sizes

Model: Sarah 
Wears: Size Medium
Height: 173cm / 5'6.5"

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