Keystone Running Tank

Base Layer
Availability: In stock
This relaxed fit, lightweight Merino singlet can be used as traditional, loose fit layering piece in cooler weather, or to stay cool and comfortable in warmer weather. Perfect for hiking, running, yoga, working out and more!

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This relaxed fit, lightweight Merino singlet can be used as traditional, loose fit layering piece in cooler weather, that still looks the goods when worn on its own if the weather warms up. Or wear it solo for its natural, thermo regulating, insulating properties to stay cool and comfortable during the warmer months. Perfect for hiking, running, yoga, working out and more.

While Merino is best known for helping you stay warm in cold weather, this tank will do an amazing job at helping you stay cool in warm weather too. Here at ioMerino, we’re passionate about helping you stay comfortable throughout the entire year and this awesome singlet, will help you do just that!

Made with 100% superfine Australian Merino, the Keystone singlet is not only unbelievably soft and lightweight, it’s also packed with natural MicroMerino® performance including breathability, temperature regulation, moisture wicking and odor-resistance – all of which play a big part in helping you stay comfortable even when the temperature rises.

The versatile, everyday fit features a sportier cut than a traditional, wide-strap tank top, and is perfect for those of us who love looking and feeling great.

Key Features: 

  • Made with the superior MicroMerino® Cipher – 100% superfine 18.5 micron Australian Merino wool
  • Incredibly soft and lightweight (150gsm) – perfect for a range of activities such as hiking, running, yoga and working out
  • Can be used as a loose fit layering piece for extra warmth when it’s cool
  • Naturally breathable, temperature regulating and odor-resistant helps you stay cool in warm weather
  • Versatile, relaxed fit
  • Flat lock seams and heat transferred tags to prevent uncomfortable chafe 


What you need to know: 

  • Weight: Lightweight (150gsm)
  • Fit: Everyday, relaxed fit
  • Length: Finishes top of thigh
  • Fabric: Exclusive MicroMerino® Cipher – 100% superfine Australian Merino wool

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 Running Tank

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Measurements by inches and centimetres

    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+