Ultra Tee - Big Heart Adventures

Fabric Guide

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The Men's Ultra Tee is as soft and comfortable as ever combining all the natural benefits of our finest MicroMerino® fabrics with just enough nylon to create our most durable fabric ever to withstand the most demanding adventures

A true high-performance garment packed with extra performance features like tag-free labels and flatlock stitching that eliminates chafing and maximize comfort, and the reflective trims have been added for extra safety in low light.

Wear it on its own to stay cool in warm or mild weather, or as part of a layering system when the temperature drops

Print to order.Exclusive Big Heart Adventures print.  

True to size.

Model wears size medium.

Made with lightweight 83% superfine Australian Merino Wool, 12% Nylon for durability and 5% Elastane for an easy four-way stretch and freedom of movement.

Lightweight 160gsm

83% superfine Australian Merino Wool

12% Nylon for extra durability

5% Elastane for an easy all-way stretch



Customer Reviews

Based on 25 reviews
Anonymous (Brisbane, AU)
Ultra tee

Great comfy T-shirt - great for a wide variety of sports or casual wear

Steve W (Adelaide, AU)

Have a few of these and have just completed Heysen105 ultra in them. Perfect for trail running, cool and wicking if it’s warm and warm enough when it cools, especially if layered. No rubbing under the hydration vest. Great just as a casual T-shirt too.

Adrian T (Melbourne, AU)
Excellent quality and genuine sizing

Online buying can be hit and miss when companies aren't accurate in their claims of sizes and quality but ioMerino is perfect in both. The size was exactly as described and their review of fit in the description was spot on (one shirt I looked at advised about the slim fit so I avoided it like the plague). I also like that they haven't tried to save money during production by cutting the shirt too short (like some other companies - really annoying if they do). It provides good length for lower back warmth and enough length to tuck it in nicely. Very comfortable and easy care with the small non wool content.

Jacob H. (Port Orchard, US)

The orange was perfect for a hunting t-shirt. Also it was the only shirt comfortable enough to wear while I had COVID-19 :D

Jon B (Perth, AU)
Great Shirts

Very comfortable, no annoying labels. Great fabric. A few more colours for the polo shirt would be good.

Andrew Loose (Adelaide, AU)
All day everyday!

Now I don't work routine hours I live in jeans and teeshirts(io merino - of course) and they're "magic"


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: