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Altitude Tee

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Color
Green
Black
Rust
Charcoal Marle
Size

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 wears size small in rust.
Model wears size medium in green, black, and charcoal marle.

Model specs - height 181cm, chest 103cm, waist 81cm.

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 31 reviews
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M
Mark Daley (Breckenridge, US)
Summer T-Shirt

To get the right fit I sized up, and it is now part of the summer t-shirts

A
Andrew Jarvis (Perth, AU)
Quality Product

Very happy with this purchase. Fits well. Well made. And does it’s job. Keeping me warm.

C
Cass
Altitude Tee

I'm really happy with my Altitude Tee. It fits exactly as described and pictured. It IS a clingy item, but doesn't feel tight. I wear it for cooler weather personal training, and the Altitude Tank for warmer weather training. For the purpose, I appreciate the extra length of the Altitude range. The colour (green) suits my preference, and I'd like to see this colour as an option on more products! Like my other IO products, the feel of the merino wool is pleasant. It feels like a 'quality' item. The delivery was prompt, and I appreciated the discount that was available at the time. And best of all, the IO people are great to deal with!

J
JL (Sydney, AU)
Consistent Quality

I live in these clothes, love merino wool!

R
Ross Angood (Sydney, AU)

Very happy with the product

A
Adam Kavanagh (Throsby, AU)
Equally good in the cold and the heat

I am impressed with how good this feels even in warmer weather. a really comfortable piece of running kit.

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