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Altitude Boxers - Ready for Adventure

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+

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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Blue
Stone
Black
Stripe Blue/Oatmeal
Forest Marle
Port Marle
Dark Blue Marle
XS
S
M
L
XL
XXL

Don't ruin great layers with average undies. Made with superfine Australian Merino wool, our best-selling lightweight Altitude Merino Underwear offer superior performance to keep you warm and comfortable when you need it the most. The Altitude Active Boxers are sleek, regular fit, breathable, temperature regulating and odour resistant.

Designed to fit perfectly under another performance layer like our Chaser Leggings or Altitude Tights, they are leaner, firmer, active style, with less fabric in the legs and crotch.

Wear them every day. While you’re travelling. Camping. Up a mountain. While you’re skiing. Or to a business meeting if you like. It’s up to you. One thing’s for sure, you’re going to love them. Say goodbye to ordinary undies, and hello to the Men's Altitude Active Merino Boxers.

Tag-free labels, flatlock stitching and a flexible and ultra-soft ioMerino elasticated waistband help eliminate chafe and bulk and maximize comfort and a self-fabric fly adds both comfort and function.

Everything! 

Made with 170gsm lightweight 96% superfine Australian Merino and 4% Elastane MicroMerino® - for an easy four-way stretch and freedom of movement.

Worldwide express shipping on all orders.

All orders are processed in Australian Dollars

Delivery times: 

Australian Orders 1 - 5 business days (Star Track, Toll Ipec and Express Post)

International Orders 2 - 8 business days. (DHL)

Shipping costs:

Australia and New Zealand - Free shipping on all orders greater than $100 AUD. $10 AUD for all other orders. 

USA - Free shipping on all orders greater than $200 AUD. $15 AUD for all other orders. 

Canada, Europe and UK - Free shipping on all orders greater than $250 AUD. $25 AUD for all other orders. 

Asia - Free shipping on all orders greater than $200 AUD. $20 AUD for all other orders. 

Try it, wear it and don’t love it? If your not 100% satisfied with your gear, return it within 60 days of purchase and we’ll happily offer you exchange, refund or store credit. Valid on full priced items only. 

Gift cards are not eligible for exchanges, refunds or store credit. 

Please note all returns for change of size or change of mind are at the expense of the customer. 

Sale items are final and cannot be refunded or exchanged.





Customer Reviews

Based on 11 reviews
82%
(9)
9%
(1)
9%
(1)
0%
(0)
0%
(0)
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. 👌

S
S.H.
Great for every day

These are great for hiking and for every day use. I find it funny that someone wanted a shorter pair for summer (another review) as I think the length is just about right or possibly a little short. I wouldn't mind them being longer but I guess this is a good compromise. Two thumbs up.

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: