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Mullet Trail Sock

Fabric Guide Size Guide

Accessories Size Chart


All sizes are given in US Sizing 

Men's Women's
S 4 - 6 5.5 - 7.5
7 - 10 8.5 - 11.5
L 11 - 14 12 - 15.5

Arm warmers

Measurement given for bicep width and arm warmer length. Measure around the fullest part of your upper arm in a relaxed position. 

Use the chart below to determine your size. If you’re between two sizes, order the smaller size for a tighter fit or the larger size for a looser fit.

Approximate measurements only. 

Bicep Arm Warmer Length
XS 27 - 28 cm 45 cm
S 29 - 30 cm 46.5 cm
31 - 32 cm 48 cm
L 33 cm + 49.5 cm


Hand Length - Measure from the top of your middle finger to the base of your hand. 

Use the chart below to determine your size. If you’re between two sizes, order the smaller size for a tighter fit or the larger size for a looser fit.

Chaser Gloves:

S/M 16.5 cm
L/XL  18.5 cm 

Newton Gloves:

S 16.5 cm
18.5 cm 
L 20.5 cm

Skull Cap

To measure your head circumference, take a sewing measuring tape and wrap around your head so that the measuring tape winds just above the ears, in the middle of your forehead and in the centre back of your head.

Use the chart below to determine your size. If you’re between two sizes, order the smaller size for a tighter fit or the larger size for a looser fit. Approximate measurements only.

Head circumference
S/M 50-60 cm
M/L  60-70 cm 

For further assistance with sizing, contact us here.

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Dark Blue
It’s taken us forever, but we’ve finally managed to make a sock designed specifically for our trail loving friends. 
Unlike the famous mullet haircut which is ‘business up the front, party down the back’, our Mullet socks are ‘business down below and party up the top’ with super soft, anti-blister, merino-rich goodness for your feet, and then a nice pattern above the ankle. It’s basically all the benefits of our epic, best selling no-show sock, with an extra bit above your shoe line for people who like their socks a bit longer. 
Like our no-show socks, there’s the ventilation panels for even more breathability, padded panels for even more comfort, but with these there’s the extra bit up top for even more ‘oh they look nice’.
Overall the socks is 63% merino (with 35% polyamide and 2% elastane) but actually, the foot of the sock is closer to 80% because we really only added the poly up top to make the mountain pattern work. 
(Merino feels great but it’s hard to do nice patterns with it on socks so we went with bit of extra poly up there. As you probably know, we hate synthetics and prefer to use as little as possible but you guys kept telling us you really wanted socks like these so we finally caved and made them for you. You’re welcome.) 

Mid-weight, mid-calf length, unisex style.

Model wears size medium. Model typically fits into a size 7 or 8 shoe. 

Size Guide.


Trail Running

Mountain Bike Riding


63% Merino Wool

35% Polyamide

2% Elastane. 



Customer Reviews

Based on 6 reviews
Silvia (Weissenburg in Bayern, DE)
Toasty warm and super comfy

I have A LOT of socks and these are now my favorite winter cycling sock!
I’ve worn these cycling in the cold and they don’t only look pretty rad, they also keep your footsies toasty warm
I also wanted to use them trail running but for that I prefer a tighter fit. I wear a size 40 shoe and I will go for a size small for my next pair instead of medium.
I did nevertheless use them for some hiking in Austria. I thought I’d only wear them for half a day as it was quite warm, but my feet did not feel too hot by midday so I left them on. My feet had no problems whatsoever, so I know they will be awesome for trail running as well. I really would love a mid-length sock like that!

Tony (Wonthaggi, AU)
Mullets deliver the goods

New Mullet socks are the most comfortable trail socks I have found. Heaps of padding for the long trails keeping the feet nice and toasty on the winter runs. The ankle cover is perfect to stop all kinds of stuff getting into the shoes. My new go to socks for trail runs. Awesome stuff from IoMerino

Sarah (Sydney, AU)
Great all rounders

Bliss for the feet. Reluctant to wear these out on the trails as they make such comfy van/house socks but I know with being wool they will stand the test of time. Wore them in a crucial part of a long run where there was multiple wet feet stream crossing followed by steep and rocky terrain and these beauties kept my feet warm and in great condition. Ladies probably best to size down for a more firmer fit.

T.O. (Adelaide, AU)
Yep good!

Bought these socks for my husband as he likes to wear wool socks for work and any time really. He says "Yep good!.. the softest woollen sock I've worn & they stay up".

Michael Harry (Brisbane, AU)
Mullet Socks

I like my new Mullet socks , better than others .

Fraser (Adelaide, AU)
The best Mullet you'll ever wear

I wasn't convinced by the marketing spiel at first with these socks. What do you mean, how can a sock be like a mullet? But it was right (I was a fool to doubt it) these socks are all business down below and party up the top. The bottom half, where your foot is, is very comfy and performs like any other good quality merino sock. Gets the job done like a good business person, no questions asked, it's just business as usual for I/O merino here. The top half though is where the money is. The tighter fit that is achieved through the higher proportion of polyester fibres makes it feel and look like a fancy cycling sock. The tighter fit also means the sock doesn't slip down, even when trail running in them for hours like I was, and I'm guessing is going to reduce any long term wear on the sock too. And finally, there's a pretty outline of mountains so you don't have to tell your friends you like going outside for fun, you can just show them with your socks! The only thing I'm yet to test with these Mullets is whether or not they work like Mullets did in the 80's...


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: