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Altitude Tee

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Color
Forest Marle
Charcoal Marle
Green
Black
Rust
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. 

Why you’d buy this: You like your stuff to fit nice and close to your body whether you wear it on its own, or under another layer and don’t want any extra bulk or bunching. You might also want a bit of extra length which this one gives you. It’s super soft and comfy, and 96% merino so it’s super natural which means almost no microplastic issues when you wash it or landfill when you’ve finished with it.

As with all our clothes, the merino delivers natural temperature regulation, breathability, moisture wicking and odour resistance.

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 forest marle, green, black, and charcoal marle.

Model specs - height 181cm, chest 103cm, waist 81cm (32 inch). Normally wears 32 inch pant, 10-11 size shoe.

Size Guide. Contact Fit.

Snow sports

Cycling

Running

170gsm lightweight

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 34 reviews
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G
Graham White (Brisbane, AU)
Worth the expense

Best and most comfortable merino clothing for the UK and Canada winter. A must buy is the base layers. Tops and leggings. Very happy with my purchase.
Easy to care.
Can't wait to use my gear for next trip to Finland 2025.

B
B (Sydney, AU)
Great base layers

One of many excellent ioMerino products I've purchased and will continue to do so. These are among the best base layers.

S
S.P.

Amazing

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!

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