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Altitude Tee

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.

 

 Men's General Size Chart

 

 

XS

S

M

L

XL

XXL

Waist

Inch

27

28-30

32-34

36-38

40-42

44-46+

 

cm

68 - 70

71-76 

81-86

91-96

101-108

111-116+

Chest

Inch

32-34

34-36

38-40

42-44

46-48

50+

 

cm

81.5 - 86

86-91

96-101

106-111

116-121

127+

 

Tracksuit Pants 

Outside Leg measurement (including waist band).

Model height 6'2 , wearing a size medium. 

S M L XL XXL
Inside Leg inch 29 30  30.5 31 31.5
cm 74.5 76 77 78.5 80
Outside Leg inch 41 41.5 42 42.5 43
cm 105 106 107.5 109 110

 

Merino-Compression Leggings

Model height 6'3 , wearing a size large. 

XS S M L XL XXL
Inside Leg  inch 25.4 26.4 27.4  28.3 29.3 30.3
cm 64.5 67 69.5 72 74.5 77

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Rust
Dark Blue Marle
Black
Charcoal Marle
XS
XS
S
S
M
M
L
L
XL
XL
XXL
XXL

Our Altitude range is designed to fit close to your body for maximum performance, so it’s tight but still soft, with plenty of give for extra comfort. Not only does the Men's Altitude Base Layer Tee look and feel good, it's also incredibly versatile, taking you through a wide range of temperatures and conditions. Wear this Base Layer T-shirt as part of our layer system for extra warmth, and when the temperature rises, you’ve got the perfect lightweight and breathable T-shirt that delivers the comfort and performance you need to go the distance.

You can always size up if you want a little more room, but it’s definitely designed to fit close to your body. (For a more relaxed fit try our Ultra or Universal T-shirts.)

Tag free, flatlock stitching, raglan sleeves eliminate chafe and maximize comfort. 

Designed to be worn as a body tight ‘contact fit’ layer. 

New improved fit. Regular body length, shorter than the Altitude long sleeve styles.

True to size. Model is 6'2" and wears size medium in Black, Charcoal Marle.

Model wears size small in dark blue marle and rust. Model specs - height 181cm, chest 103cm, waist 32inch.

Size Guide. Contact Fit.

Snow sports

Cycling

Running

170gsm lightweight

96% superfine Australian Merino

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

MicroMerino®  Fabric. 

BENEFITS OF MERINO

LIGHTWEIGHT
THERMO REGULATING
SUPER SOFT & COMFORTABLE
BREATHABLE
MOISTURE WICKING
ODOUR RESISTANT
NATURAL
ETHICALLY MADE

Customer Reviews

Based on 18 reviews
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(18)
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C
C.A.
Outstanding quality

Recently Altitude 'Mongrel' - New Season long sleeve in L (perfect fit) and Altitude Tee - Run All The Trails t-shirt in L. The T-shirt does fit a bit snugger (and is a bit shorter) so I should have got a XL in the tee but delivery was NEXT DAY and product is fabulous.

I
I.G.
Top Shelf Base layer Tee

Altitude Tee is a warm soft hug wherever you go. Does a very good job and is well worth the investment.

E
E.E.
i-o Tastic

I have tried a lot of supposed Merino base layers. A lot of brands advertise merino but in fact the merino content is low. This is reflected in their performance. i-o however is different. What a great product.
Beautifully made and performs exceptionally well. Would buy again.

S
S.P.(.H.
iO...iO....it's off to play we go

To be honest, I'm a bit of iO Merino devotee. I still have my first purchase from many moons ago and the products never disappoint. The Altitude Tee is the perfect base layer for when the long sleeve option is just a little too warm, or you want to keep your arms bare. It is perfect on hot summer days as it breathes so well and never gets stinky. I wear it around the house all year round and it does the job really well. It is super smooth next to my skin and the Small size fits me like a glove (167cm, 70kgs) - well done team!

B
B.H.
So happy to have discovered ioMerino!

Bought the Altitude Tee and thought I would give their crew socks a shot as well. Could not be happier. Just got back from 4 days of riding in Moab and both items performed way above expectations. ioMerino has moved up to the top of my list for merino wool clothing!

We love meeting our customer expectations and exceeding them is even better!

P
P.J.
My FAVORITE Base Layer T

I bought one of these in a retail store several years ago and finally wore it out. Came looking for more and was so happy to find IO Merino online! Have one more of these now, and another on the way. We have lots of choices here in the US, but so glad I can order from IO, these people are the BEST! Great service, BEST product, keeps me warm and comfortable.

Thanks for your great review, we love making our customers happy!





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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 - Celsius 

Made from 45% ultra fine MERINO (Ultra Lightweight 150gsm), 45% natural TENCEL (made from sustainably grown wood fiber), and 10% nylon for extra durability. 

 

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: