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Altitude Tee

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Color
Black
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. Designed for our trail runners, one of our best performance layers just got a makeover! The  Men's Altitude Base Layer ‘Run all the Trails’ Tee is the perfect addition to any outdoor lover’s wardrobe. 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.

The Altitude Base Layer Tee takes you through a wide range of temperatures and conditions; the high round neck offers extra protection, and the sleek, tapered fit is designed to suit all levels of activity. Wear this Base Layer T-shirt 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.

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 and looser than the Altitude long sleeve styles.

Model is 6'2" and wears size medium in Black.

Size Guide. Contact Fit.

Running

Cycling

Snow Sports

170gsm lightweight

18.5 microns

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 35 reviews
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Tauqeer Khan (Sydney, AU)
Looks great, and good choice of colours

I am regular user of extra fine merino tshirts for my gym and bike rides. I have had a few different brands. This one was well stitched and styling wise looks great. I found wool to be a little chafey compared to some other brands (not sure what merino fiber grading is this), also I wish they would provide technical info such as weight in grams, and merino grade (how many microns). Also I am not sure if there is any mixed elastin/lucra or another blend fibers added

Hi Tauqeer and sorry to hear you had a chafing issue. That’s super unusual and not something we can remember hearing from any of our customers unless there was something else rubbing - we’d actually really like to know more about where it chafed so we can understand the problem better, and as part of our money back guarantee, if you’re not happy, we will absolutely replace or refund your top no worries at all. Just contact customer service to arrange that. Just so you know, we can confirm the online product description has a fabric tab that shows this top is 96% merino (we only add 4% elastane to give it some extra stretch), and depending on how you are hoping to see weight measured, we supply the standard gsm measurement which is 170gsm. (We don’t weight every size etc, just give the industry standard gsm which is grams per square metre.) As far as microns go, although that is not listed on our fabric description we have a whole page of info about our ‘MicroMerino’ fabrics which explains it’s 18.5 microns which is classified as ‘fine' and on the cusp of ‘superfine' - you’ll find that here: https://iomerino.com/pages/micromerino
 - which is about as fine as you can go in clothing like this without starting to compromise durability. Please feel free to contact customer service so we can help you with your top.

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
Brett Kahlert (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.

M
M.Z.

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.