Ultra Crew Neck - S.A Rogaining Edition

Fabric Guide

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The Women's Ultra Crew Neck Base Layer top 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

Designed with Ultra Runners in mind we made it extra comfortable and extra durable. Still Merino-rich, and perfect for adventure racing and what in Australia, we like to call ‘bush bashing’. 

A true high-performance garment packed with extra performance features like tag-free labels and flatlock stitching that eliminates chafing and maximize comfort. The thumb loops keep your hands warm and stop your sleeves riding, and the reflective trims have been added for extra safety in low light.

Print to order. Exclusive SARA limited edition print. 

Designed with a body-skimming, sports fit.

True to size.

Model wears size small.

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 7 reviews
Hayley (Perth, AU)
Perfect for multiday hikes

3 days of sweaty multiday hiking and no smell at all. Very comfortable and no chafe when carrying a pack for multiple days. The red is perfect and stands out well when I’m tail end Charlie. I will definitely be purchasing more.

Jennifer Scott (Sydney, AU)
six star rating

The perfect casual sports top. I now have a blue and red ultra crew neck and ready to buy more. They may cost a bit, but you won't be sorry. You can wear them for days and they don't smell. Perfect for Autumn to Spring. I hike and run in my crew neck ultra.

Carla K (Adelaide, AU)
So good I've already purchased more!

Such a high quality product. Love the fit and the fabric. I usually wash any active wear after each run but after feedback from some running friends decided to go three wears before washing to see how it held up. They were right, there's no smell at all! I also had a brilliant experience with customer service and have since gone back to order two more tops and a buff. Safe to say I'm an ioMerino convert!

Jahne (Brisbane, AU)
Very comfy

This top is very comfy. It is well fitted without being too tight and fits a women's body shape very nicely.

Sarah D (Melbourne, AU)
Great in the cold

I work my top this morning for a run with the feels like temp of -3.3. It was perfect.
The arms are a little roomier than I expected, but this was not a problem.

Jenny Nethery (Sylvania Waters, AU)

Perfect fit and beautifully soft on my skin.


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: