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Ultra Trunks

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Color
Dazzling Blue
Black
Chilli Pepper
Size

If you’re not a boxer guy, or a brief guy, these trunks sit quite nicely in the middle thanks very much. Made from our ultra comfy Merino+ fabric, (it’s the same epic fabric we use in our Ultra range of tops!), they deliver all the comfort and performance you’ve come to expect from our premium merino fabrics, but in a more streamlined fit. They're a bit more snug than our Altitude Boxers, with a little more coverage than our briefs, They fit true to size, but if you’re coming across from our Altitude Boxers you may want to size up.


Tag-free labels, flatlock stitching and a flexible, ultra-soft ioMerino elasticated waistband help eliminate chafe and bulk and maximize comfort. Say goodbye to ordinary undies, and go with Men's Ultra Merino Trunks.

True to size - but if you’re a fan of our existing Altitude boxers you may want to size up.

Model wears size small in black and chilli pepper. Model specs - height 173, chest 99cm, waist 76cm.

Model wears size medium in dazzling blue and navy. Model specs - height 181cm, chest 103cm, waist 81cm (32 inch).

Designed to fit perfectly under our other layers, they are a firmer fitting, active style, with less fabric in the legs and crotch.

Size Guide. 

Everything! 

Lightweight 160gsm

83% superfine Australian Merino Wool

12% Nylon for extra durability

5% Elastane for an easy all-way stretch

BENEFITS OF MERINO

LIGHTWEIGHT

THERMO REGULATING

SUPER SOFT & COMFORTABLE

BREATHABLE

MOISTURE WICKING

ODOUR RESISTANT

NATURAL

ETHICALLY MADE

Customer Reviews

Based on 9 reviews
78%
(7)
22%
(2)
0%
(0)
0%
(0)
0%
(0)
M
Muzza (Buln Buln, AU)
Great undies

ioMerino trunks and boxers are just the best. People think that wool undies would be so uncomfortable, but nothing could be further from the truth. Silky smooth fine wool, not in the least pickly, stink resistant, so comfy. If marooned in the jungle for a week, these are the undies I would want to be wearing. And ioMerino is so helpful/cooperative if you find you have messed up your order. Highly recommend.

S
Shane Kennedy (Brisbane, AU)
Very comfortable

My favourite underwear after trying a lot of brands and styles (I have tried the ioMerino Briefs but not the Boxers, if that helps). Very comfortable, the right support for me, and I like the vibrant colours too.
Note I wear size 32 pants and Medium shirts but I found size XL was the best fit for my body and preference. I suggest buying one at a time until you are happy with the fit (and then buying a bundle or two!).

A
Anonymous (Bern, CH)
Unfortunately too "ultra"

I normally wear a size M. I wear the boxer shorts from iO (size M) often and very happily. I should probably have chosen a size larger for this model. The quality is top but in my case unfortunately not stretchy enough and therefore too uncomfortable for everyday wear.

P
Philip Pascoe

Very comfy, fits well. Prompt delivery. I’m a total merino guy.

P
Philip Pascoe (Brisbane, AU)
Ultra Happy

I have found the Ultra Trunks to be very soft, supportive and comfy. The sizing is accurate. Perfect for my bushwalks. I just about live in merino.

C
Campbell Aitken (Melbourne, AU)
truly excellent underwear

comfy, wicking, long-wearing, dry fast, look great - what else do you need?

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