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Altitude Tee - Southern Cross

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Colour
Charcoal
Size
Design

Our Altitude range was originally designed as a baselayer, to fit close to your body for maximum performance, so it’s snug but soft, with plenty of give for extra comfort. If you’re usually a medium, for example, you might find the medium fits tighter than you’d expect because it’s designed to be ‘contact fit’ and look and feel like a second skin. If you’re looking for a more relaxed fit you might consider sizing up (it will still be relatively snug) or choosing another style

The Men's Altitude Base Layer ‘Southern Cross’ Tee is the perfect addition to any outdoor lover’s wardrobe, designed to suit all levels of activity. It’s super lightweight, breathable yet incredibly warm. This T-shirt is ready to keep you warm, comfortable and protected from the elements during all of your trail adventures, no matter how big or small they might be.

Wear with extra layers for extra warmth when the weather hits hard, and when the temperature rises, you’ve got the perfect lightweight and breathable T-shirt.

(For a more relaxed fit try our Ultra or Universal T-shirts.)

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

Originally designed to be worn as a base layer, (is usually underneath something else), this is a ‘contact fit’ layer so will hug your body. If you don’t want it to fit, feel or look like a second skin, you might try another style, or go up a size, but please note: even going up a size will fit quite close to your body because of the fabric and cut. 

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

Model wears size medium in 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.

Running

Cycling

Snow Sports

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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