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Altitude Boxers - Ready for Adventure

or make 4 interest-free payments of $12.00 fortnightly with More info

Color
Forest Marle
Blue
Port Marle
Black
Black/Natural Stripe
Size

Don't ruin great layers with average undies. Our best-selling lightweight Altitude Merino Underwear offer 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 Men's Altitude Active Merino Boxers.

True to size. Model wears size medium. 
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, they are leaner, firmer, active style, with less fabric in the legs and crotch.

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 33 reviews
88%
(29)
9%
(3)
3%
(1)
0%
(0)
0%
(0)
D
Darren Gaudry (Brisbane, AU)
Extremely Happy! 🤩

As I prepare for my upcoming 800 km hike across Spain on the Camino de Santiago, I’ve turned to IO Marino for my gear, and I couldn’t be happier with my choices. I’ve purchased several items, including underwear, shirts, and warm-weather gear, all of which have exceeded my expectations. The quality, comfort, and durability of their products are top-notch, making them the perfect fit for my journey. I’m now a customer for life and highly recommend IO Marino to anyone looking for reliable outdoor gear. ⭐️⭐️⭐️⭐️⭐️

C
Clifford Grove (Narangba, AU)
First impressions

Good fit good comfort

D
David Fell (Sydney, AU)
Altitude Boxers

The boxers themselves are excellent. Great material and a great fit. What set ioMerino apart was the proactive customer service. I was very impressed

M
Michelle Hayward (Sydney, AU)
Present for him

He loves them !!
"Most comfortable undies ever"
Now he needs 7 pairs 🙄
Umm no photo or video
Noone needs to see that.......

D
Damien G
Happy To Pay More If They Last

Seem good. The extra length is a good point of difference. Fit a little larger than expected. I'm usually a Large in merino boxers and I think a Medium might have been better for these. Also a little thinner than expected, so will see how the durability goes. Hopefully better than too many pairs of Mcpac.

A
ASham (Sunbury, AU)
I will never wear any other type of underwear again

I tried a couple of pairs of io trunks and boxers, and both styles were exceptionally comfortable, leaving any cotton or synthetic underpants for dead. I have now bought enough to not have to wear anything else.