How to layer Merino Wool


Some people completely overlook underwear as the foundation of their layering. Big mistake. Ordinary underwear can really compromise the benefits of your next layers. Flatlock seams, no tags and the same breathability, moisture control and odour resistant properties as the rest of our layers makes our ‘Zodiac’ underwear the perfect starting point.

With underwear taken care of, you’ll want your first ‘official’ layer to sit comfortably smooth and tight against your skin. This sets you up for all types and levels of activity and the rib textured fabrics used in our ‘Vital’ Collection is exactly what you need. This super warm and comfortable fabric has been specially designed to wick moisture away from your skin while the ribbed texture creates little pockets of air and it’s the combination of these two effects that deliver unrivalled warmth when it’s cold, yet keeps you from overheating when it warms up.

Base Layer

Your Base Layer should deliver maximum heat retention and our Altitude and Ultra Ranges do exactly that. These Base Layer ranges are lightweight and when layered over the Vital Second Skin Layers they deliver the ultimate in temperate control. This is the next best thing to having an actual temperature dial on your clothes.

The fabric used in our Base Layer collections are still wonderfully lightweight and keeps you warm and dry without the risk of overheating. Thanks to just the right amount of elastin (4%), you’ll enjoy a nice 4-way stretch for a full range of movement whether you’re climbing up a mountain, racing down the slopes, or reaching across the bar.

Mid Layers

If you’re looking for more warmth than a Base Layer and want a lightweight layer that’s perfect for when the weather hits hard (and easy to throw in your pack when it warms up) then our Mid Layers are for you.  At 265gsm+ they are significantly thicker than our Base Layers fabrics, but every bit as comfortable and still incredibly lightweight.

Our Mid Layers Ranges - Pinnacle and Elemental have textured fabrics which help create an air layer between it and the Base Layer to add an extra level of thermal protection. Or in milder condition,s you can always wear your Mid Layers on its own as it has a great next-to-skin feel.


For maximum warmth and durability, you can add a final, Outer Layer to your outfit. Ranging from 230gsm tracksuit pants to 280gsm full fleece Hoodies, Vests and Jackets, our Outer Layers are luxuriously thick, yet unbelievably lightweight and breathable. Even without a waterproof shell, these fabrics will repel water and add another layer of natural insulation to keep you warm and comfortable when you’re in the kind of conditions that make for great adventures but aren’t all that pleasant to be out and about in. Unless you’re layered up properly, of course!

Our Outer Layers also happen to be perfect for before and after adventures or, let’s be honest, doing absolutely nothing at all when you’re just lounging around the house. 


If you need a quick, easy guide to working out which layer is best for you, where you’re going and what you’re doing, look to further, we've got you covered right here. 

What to wear


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: