High-Performance Merino Wool Base Layers for Running

Looking for running clothes? We've got them! Whether you’re running on the road or the trails, out early or late, day or night, fast or slow, winter or summer, we've got the perfect high-performance Merino Wool Thermal layers for you.  Our range of lightweight merino clothing is perfect for running and will help you stay ready for anything out on your adventures.

As official sponsors with approved and compliant mandatory gear in some of Australia’s biggest running events, including Ultra Trail Australia and Trail Running South Australia, we’re not just all talk – even the experts happen to agree with us on this one!

Our running base layers are made with superfine Australian Merino Wool, they're lightweight, soft, comfortable and temperature regulating to see you through a wide range of temperatures. We've got you covered for a lap around the block through to ultra marathons and beyond. 

Shop Men's and Women's Base Layer Running Tanks, Running Tees, Long Sleeve Base Layer Tops, Thermal and Compression Tights, Merino Running Socks and more.

If you'd like expert advice from our trail running team, click here for more gear info. 

Read some of our trail running blog here. 

1 2 3 Next


Fabric Guide

While Merino is an amazing natural fibre, not all Merino fabrics are created equal. At ioMerino, we make our own fabrics, using only the best quality fibres, and to very specific specifications that make the most of the natural benefits of Merino. All of them are 'Merino rich’. No cheap blends passed off as Merino. No cheaper scratchy fibres or synthetic substitutes to save money. No unethical production. And each fabric is made for a specific purpose. So if you see something with a small amount of elastase or nylon added, you can be sure it absolutely needs to be there to enhance the natural stretch and durability. 

It took every bit of our 140 years of experience in the wool industry to perfect our fabrics, but we think you’ll agree the end result was more than worth the effort.

Ethically Made. Ethically Sourced. Perfectly Natural. 


Altitude / Zodiac

Lightweight 170gsm 96% Australian Merino Wool with 4% elastane for extra stretch and comfort. A MicroMerino® Fabric. 


Ultra / Universal

Lightweight 160gsm 83% Australian Merino Wool blended with 12% nylon blended for extra durability and 5% Elastane for stretch and comfort.



Midweight 265gsm 96% Australian Merino Wool with 4% elastane for extra stretch and comfort. A MicroMerino® Fabric. 


Summerino - Celsius 

Made from 45% ultra fine MERINO (Ultra Lightweight 150gsm), 45% natural TENCEL (made from sustainably grown wood fiber), and 10% nylon for extra durability. 


Summerino - Keystone 

Ultra Lightweight 150gsm 100% Australian Merino Wool. A MicroMerino® Fabric. 


Merino Compression

Midweight 280gsm 76% Australian Merino Wool, 15% Elastane and 9% Nylon for extra stretch and compression properties.



Ultra lightweight ribbed 155gsm 100% Australian Merino Wool. A MicroMerino®  Fabric. 



Outer Weight 280gsm Fleece 100% Australian Merino Wool. MicroMerino®  Fabric. 



Midweight 260gsm 100% Australian Merino Wool. A MicroMerino®  Fabric. 



Midweight 260gsm waffle texture 100% Australian Merino Wool. A MicroMerino®  Fabric. 


Stride / Glacier / Velocity

Midweight 255gsm French Terry 100% Australian Merino Wool. A MicroMerino®  Fabric. 


Natural Merino Wool benefits: