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Newton Arm Warmers

Fabric Guide Size Guide

Accessories Size Chart


All sizes are given in Men's US Sizing 

S 4 - 6
7 - 9
L 10 - 12
XL 13 


Arm warmers

Measurement give for bicep width. Measure around the fullest part of your upper arm in a relaxed position. 

Approximate measurements only. 

XS / S 23 - 28 cm
S / M  29 - 33 cm
L / XL 34 cm +


For further assistance with sizing, contact us here.

or make 4 interest-free payments of $13.75 fortnightly with More info


Made from our revolutionary, new, Merino Wool compression fabric, the Arm Warmers are ideal for changing weather conditions and trans-seasonal weather. They maximise heat retention and offer additional coverage in low temperatures, but are easily removed or rolled down if it warms up or if you're wearing a pack.

Unlike regular arm sleeve, this fabric has a high merino content so are fully breathable, lightweight, and deliver both UV protection from the sun and warmth without bulk, and help stop you overheating. Pair with a t-shirt to add some additional warmth and versatility to your favourite short sleeve ioMerino.

Tag-free labels and flatlock stitching eliminate chafe and maximize comfort. Silicone grippers at the inside top hem to hold them securely in place around your arm and the reflective trims add visibility in low light conditions.

Model is 6'2" and wears size L/XL. 

Choose size based on what base layer top size you wear. 

Size Guide. Contact Fit.



Midweight 280gsm 

76% superfine Australian Merino Wool

15% Elastane for compression, lift and support

9% Nylon for added durability

Customer Reviews

Based on 6 reviews
arm sleeves

love them going to use them for my 24hr running event

Thanks for the awesome review, Carmen.
Love them.

These are the first arm warmers i've ever owed, great fit and kept me warm on a cold morning. They easily rolled down to my wrists when I got too warm and didn't feel uncomfortable.

Hi Gayl, so glad to hear you love the arm warmers! They're a staff favourite as well. Come back and shop with us again soon!

Wore the arm sleeves recently in Katoomba for UTA 50KM. Very warm and comfortable. I completely forgot they were on and easily rolled down and removed whilst running. Very happy with prompt delivery.

Congratulations on the UTA50! So glad to hear the arm warmers were part of your kit!
Ultra Trail Australia Arm Warmer Review

The arm warmers stayed up all day and helped stop the pain I usually get in my chicken wings from them jiggling around. Also, they gave me a good sun protection. Even though it was warm and sunny, i didn't over heat.

Thank you for taking time to let us know how your arm warmers went Sarah. We really appreciate you taking the time out to share your experience with us. Come back and shop with us again soon!
Can't have enough sleeves in your wardrobe!

I have my fair collection of arm sleeves in my run wardrobe and were keen to try these for - to be honest - the compression, the fabric, the everything - LOVE LOVE LOVE them.

What I do love about the sleeves is that 'mid' season, you can start with your arms covered, then as you warm up slip them down! Now to get you guys to make some STRIPY ones like the mongrel. Guaranteed these will run out the store.

Thought I would hate these. But they're awesome.

I've seen people wearing arm warmers before and to be honest, always thought they were a bit weird and silly. Not any more. I'm usually someone who wears a long sleeve top and pulls the sleeves up if I get warm. But wearing a T-shirt or tank and arm warmers and being able to pull my 'sleeves' down - or take them off completely - has been awesome. A totally different experience and I have to admit, way better and more flexible as a way to cope with fluctuating temperatures throughout the day - turns out these arm warmer things are pretty good. And of course, if you love ioMerino's other stuff, you'll love these. Not sure how I ever survived without a pair of these in my kit before now.

(The only reason I didn't give them 5 stars for comfort is I'm still getting used to how firm they sit at the top of my arms. Not UNcomfortable, just takes a bit of getting used to.)


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 - 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: