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Ultra Trunks

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Color
Black
Chilli Pepper
Dazzling Blue
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. Model specs - height 173, chest 99cm, waist 76cm.

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 7 reviews
71%
(5)
29%
(2)
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(0)
0%
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0%
(0)
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

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
CKA (Melbourne, AU)
truly excellent underwear

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

m
martin moses (Melbourne, AU)
the best trunks on the market

being an avid supporter of the merino industry and io merino product i purchased 3 pairs of the mens trunks about 12 months ago- it was not long before i dreaded wearing the cotton brands i was wearing prior to that. I then purchased enough IO mens trunks to ensure i had 100% comfort 100% of the time.

A
Angus Hughes (Melbourne, AU)
Best crusties!

Very comfortable. Will be ordering more.

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