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Altitude Briefs

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Colour
Deep Forest Marle
Moroccan Blue
Black
Rust
Size

Don't ruin great layers with average undies. Our best-selling lightweight Altitude Merino Underwear now come in briefs! Rest assured, they're every bit as soft, lightweight, warm and comfortable as the rest of our high-performance thermal layers, offering superior performance to keep you warm and comfortable when you need it the most. 

Tag-free labels, flatlock stitching and a flexible, ultra-soft ioMerino elasticated waistband help eliminate chafe and bulk and maximize comfort and a self-fabric fly adds both comfort and function. Say goodbye to ordinary undies, and hello to the new Men's Altitude Merino Briefs. 

True to size. 
Model wears size small in black and rust. Model specs - height 173, chest 99cm, waist 76cm.
Model wears size medium in forest marle and moroccan blue. Model specs - height 181cm, chest 103cm, waist 81cm (32 inch). Normally wears 32 inch pant, 10-11 size shoe.

Self fabric real fly. Mid rise. 

Designed to fit perfectly under our other layers.

Size Guide. 

Everything! 

170gsm lightweight

18.5 microns

96% superfine Australian Merino

4% Elastane - for an easy all-way stretch.

A MicroMerino® Fabric.

BENEFITS OF MERINO

LIGHTWEIGHT

THERMO REGULATING

SUPER SOFT & COMFORTABLE

BREATHABLE

MOISTURE WICKING

ODOUR RESISTANT

NATURAL

ETHICALLY MADE

Customer Reviews

Based on 9 reviews
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(8)
11%
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J
Jen (Brisbane, AU)
Husband says very comfy

Bought these for my husband who has advised they are super comfortable and breathable
Will be buying more shortly to replace all his current underwear

M
Matt (Melbourne, AU)
Great fit and extremely comfie

Lovely material and good sizing. Extremely comfie. Also professional, friendly, and very efficient customer service when having an item replaced.

M
Michael Hanson (Launceston, AU)
My fav undies

Well made, natural and a supportive feel!
Will be my go to undies from now on

D
Dan M
Rad undies!

I’ve been searching for natural fibre jocks for running, found just what I need in “io”, supremely comfy, a “barely there” fit and so far, chafe free! Highly recommended!

P
Paul Rix (Adelaide, AU)
Great knickers

I recently purchased two pairs of these and after only one day to try them out I will grab another pair. So comfy , especially the very soft stretchy leg hems. No chafing, YAY

M
Muzza (Caroline Springs, AU)
Almost perfect

I love wool undies. With wool you only need one pair (ha ha, but almost true!). These are great quality. My only quibble, like all or most jocks, the elastic at the top of the legs is just a little tight for me.