Keystone Long Sleeve

Mid Layer
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Availability: In stock

The Keystone Longsleeve is lightweight, comfortable and incredibly versatile. This is the perfect casual fitting layer if you’re looking for natural MicroMerino® performance, but prefer something slightly more relaxed than our ‘contact fit’ base layers.

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The much loved Keystone is back by popular demand – and with a new and improved design, it looks, and feels, better than ever before. It makes the perfect layer if you’re in need of some lightweight warmth and performance, but prefer a slightly more casual, relaxed fit than our ‘contact fit’ base layers. Hey, we get it, base layers aren’t perfect for everyone, especially if you’re not wearing them as a base. And especially for those of us who aren’t rocking six packs! 

Made with 100% superfine Australian Merino, these tops have a natural two-way stretch for freedom of movement. Plus, the flat lock seams and heat transferred tags help eliminate any uncomfortable chafe and maximize comfort.

Wear the Keystone on its own when you’re travelling or adventuring in mild conditions, or pair it up with extra layers such as the Altitude Crew Neck Base Layer during those epic adventures when the weather really hits hard. 

Key Features:

  • Superior 18.5 micron soft and lightweight Cipher MicroMerino®
  • Casual, relaxed fit with a natural two-way stretch for freedom of movement
  • Flat lock seams and heat transferred tags to prevent uncomfortable chafe
  • Ultra Trail Australia mandatory gear approved thermals

What you need to know:

  • Layering: Mid Layer 
  • Weight: Lightweight (150gsm)
  • Fit: Regular
  • Length: Finishes high on the thigh
  • Fabric: Exclusive MicroMerino® Cipher – 100% superfine Australian 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. 


The ioMerino 'Cipher' fabric is a 150gsm single jersey knitted using 100% 18.5 micron full-fleece MicroMerino®  wool and the lightest fabric in the ioMerino range.

Ultra-lightweight, ultra-fine but incredible warmth to weight ratio. 

Benefits of the ioMerino Cipher 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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    Keystone is the key to fresh

    Review by Lisa the Laughing Adventurer on 3/24/17
    I purchased this top to keep me warm, shaded and odour free for the 6 day Overland Track hike in February. We had all weather conditions (snow/sun etc) and this top was perfect! It kept me warm under my goretex jacket, it dried quickly when I took my pack off and stopped sweating on sunnier days. I can honestly say it was me who held the odour but the Keystone top was fine and I didn't wash it in those 6 days. I would recommend this top for those looking for a thinner style of merino top but wanting sun protection and a good layer for use in between seasons. Loved the colour too!

You're reviewing: Keystone Long Sleeve

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

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