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Altitude Boxers

Fabric Guide Size Guide

Men's Size Chart

Click here to learn more about our different fits and how to choose the size that's right for you.

We strive to make all our products true to size. The sizing chart below is not garment specific, but hopefully, it will give you some guidance when choosing your size. In instances where you’re perhaps in between two sizes try choosing the smaller size.

For further assistance with sizing, contact us here.

 

 

S

M

L

XL

XXL

Waist

Inch

28-30

32-34

36-38

40-42

44-46+

 

cm

71-76 

81-86

91-96

101-108

111-116+

Chest

Inch

34-36

38-40

42-44

46-48

50+

 

cm

86-91

96-101

106-111

116-121

127+

Tracksuit Pants 

Total outside leg length including waist band. Model height 6'2 , wearing a size medium. 

S M L XL XXL
Waist inch 28 - 30 32 - 34  36 - 38 40 - 42 44 - 46
cm 71 - 76 81 - 86 91 - 96 101 - 108 111 - 116
Length  inch 41.3 41.7 42.3 42.5 43.1
cm 105 106 107.5 108.5 109.5

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Stripe
Black/White Stitch
XS
S
M
L
XL
XXL

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 is 6'2" and wears size medium.

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

96% superfine Australian Merino

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

MicroMerino®  Fabric. 





Customer Reviews

Based on 13 reviews
85%
(11)
8%
(1)
8%
(1)
0%
(0)
0%
(0)
T
T.
Excellent

I bought these for my husband who thinks they are great. He finds them super comfortable to wear, quick drying and there is no chafing!

Thank you for taking the time to give these a review Tash! So glad to hear your husband is enjoying them... I've heard the Women's Zodiac Briefs are pretty great too! ;)
T
T.J.
Boxers

Brilliant boxers. Have been buying these for a few years now and they are excellent.

Hi Tim, thank you for taking the time to leave us a great review!
C
C.

I bought boxers and singlet tops for my husband who will turn 80 later
this year who has a blood disease and feels the cold we were on holidays
during the very hot spell and even temperature 107.2 degrees he felt good
,my son recommended your sporting clothing as he also uses your gear as he
is a runner.These keep my husband warm in winter and cool in summer as my
son said they would. I love how they wash so well and he wears a clean
change daily so they are constantly in the wash and they look and feel
great . Ok they are quite a bit more expensive than Bonds underwear but
after six months of using Io merino as underwear we are happy with the
outcome.

S
S.K.
Great Undies

Only had them a couple of weeks but wish I had been using them long ago. The usual chaffing issues in erm sensitive parts associated with running in hot weather have just gone away. I have found them comfortable and gotten used to wearing them very quickly.
I saw a longevity comment in another review and I’ll just say that all of my IOMerino gear is hand washed - I look after this gear pretty carefully but it gets some serious wear and I haven’t had any wear issues with any of the IOM range.

A
A.D.
Losing longevity

Love this product for all the reviewed reasons, But, what’s happened to their longevity and durability?? I hike, ski and farm in them, they’re all I wear, but their life is decreasing it seems with each batch I buy. Noticed this trend when colours were introduced, for the $’s it’s nearly time to look elsewhere for a tougher product! Please fix iomerino!

Hi Alan, Thanks for your honest review on the Boxers. We're sorry to hear that you think there has been a decline in durability. We pride ourselves on making gear that is warm, comfortable and great quality so we're certainly disappointed to hear you haven't had this experience. We have a 1 year warranty on all our products, so if you have any issues please feel free to get in contact with us at customerservice@iomerino.com and we can hopefully help you with any of your concerns. Emma - ioMerino Customer Service
N
N.D.
Love

This was a great gift for a husband who is very particular about his underwear. 👌

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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.

 

Chaser

Midweight 265gsm 96% Australian Merino Wool with 4% elastane for extra stretch and comfort. A MicroMerino® Fabric. 

 

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.

 

Vital

Ultra lightweight ribbed 155gsm 100% Australian Merino Wool. A MicroMerino®  Fabric. 

 

Summit

Outer Weight 280gsm Fleece 100% Australian Merino Wool. MicroMerino®  Fabric. 

 

Pinnacle

Midweight 260gsm 100% Australian Merino Wool. A MicroMerino®  Fabric. 

 

Elemental 

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: