Keystone Tee

Base Layer
Availability: In stock

The much loved Keystone Tee is back by popular demand – and it looks, and feels, better than ever! The perfect casual Merino Tee for everyday wear or the perfect high performance layer for your next big adventure.

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The best-selling Keystone Tee is an all-time favourite as it’s lightweight, high performing and features a casual, relaxed fit. Perfect for running, hiking, yoga, travelling, climbing mountains, jumping out of planes, you name it! It’ll keep you warm when it’s cool and cool when it’s warm. You can even sleep in it to stay warm on a cool night.

Made with one of our exclusive lightweight MicroMerino® fabrics, this Tee features a natural two way for freedom of movement. Plus, the flat lock seams and heat transferred tags help eliminate any uncomfortable chafe.

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

What you need to know:

  • 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

You're reviewing: Keystone Tee

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

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

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