Perfect shirt for trail running all year round. Doesn’t ride up your back, doesn’t chafe under the arms. Nice and bright so easily seen by oncoming hikers and runners. Very comfortable, no itch, no scratch. Definitely recommend.

Purchased this shirt about three years ago now with quite a bit of use for ultras and it is still going strong! Recently wore for a 100k event and was comfortable the entire time. Love the feel of the shirt and the design, always get compliments on it. Cannot recommend highly enough!

I purchased this t-short because all the others looked like they had short and small sleeves. I love it. The merino is good quality and is great to run in.
Sizing is small. I'm a large busted size 12 and purchased the XXL. It fits and is a little roomy - definitely recommend going up at least a size 2 if you have boobs.
I would buy agin.

I have always bought Universal Tees and I wear them daily in summer. I bought the Altitude Tee - Southern Cross as underwear that could be outerwear if I needed it to be.
The shorter sleeves, close fit and slightly lower neckline were perfect when I wore it under a long sleeved top recently. I'll buy more of these "double duty" t-shirt/underwear Altitudes. Love the Southern Cross on the shoulder too and would purchase the Southern Cross version in different colours if available (navy, red or mint green would be good!).

I was hunting for a different colour and so glad I spotted this one in purple! everyone loves purple right? I am so happy to add another IO Merion T to my collection! Very happy with my purchase, soft, breathable and very comfortable

Bought it in green. It’s extremely soft. Washing was easy. So I bought it in purple. Love them both.

Item gifted to daughter.

Great quality product. Would probably go up a size next time. I was within the sizing range but it is quite tight on me. Still ok to run in but prefer a bit less fitted.
Otherwise very happy

Bought this for my daughter who DOES run ALL trails - champion trail runner, represented Australia twice in overseas trail championships (worldwide), she epitomises the trail runner, happy, caring, loving nature. Ideal present for her, I think.

This Marino tee is perfect on its own, or a as baselayer, and is both warm and breathable. The colour of the material an stitching is lovely too. Very happy with it.

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Great fun design perfect as a base layer or T, the fit is great, it's a little longer in the body (than some of my running T's). It fits just like the pic of the model.

Gorgeous fit and comfy material to run in. Zero chafe even on long runs (20km+) which is a first for me!

Magnificent products

Good fabric

Also super fast shipping. Merino wool is the only wool I can tolerate wearing. However, compared to my shirts from other brands, these feel a bit scratchy. Hoping that will diminish because otherwise really like the shirts.

Great tee. Glad I sized up as it definitely would have been too snug in my regular size!

So comfortable, soft and warm

Love the colour/stripes in the Mongrel top, perhaps a bit on the snug side, next time I will order one size up. Washes really well and your deliver is outstanding.

A large is what I purchased because in all merino companies I've ordered from, the large is usually best for me. (5'8"-135#). Your large is a bit snugger and actually fits even better than the other companies large sizes. I'm 100% happy and hope to order more from you in the future.

Love the colour and the fit. Looks great on

Love the colour - delivered so promptly

Soft, breathable and good fitting

This was my first T-shirt purchase. I love it long runs because it transitions well from the cooler and warmer weather. It's moisture wicking feature is it's, you never can tell how much sweat it's soaked up until you take it off. Love the colour and brought a size up from my normal just because I wanted it a bit looser.

My second Altitude Tee and love it. Bought the original "'Run all the Trails" grey tee and loved it. This time I went for the Bright Rose and again so comfortable, lightweight to wear and the merino wool is perfect for all conditions. So good to have a choice of colours too.

I love the look of this top and it's nice to wear however the sizing is off in my opinion. I am pretty fit, 5'9'' and usually a size 10, I purchased the medium after going through the sizing chart. However, everything on the sizing chart checked out except the bust measurement which didn't make sense for the rest of the measurements - hence going for a medium. The result is a little loose everywhere except in the bust it's quite firm. I know it's supposed to be a more athletic fit, but not every woman looses their boobs when they're fit! Aside from that love it, not quite as soft as the Vital Crew but I know it will soften after multiple washes. Looking forward to seeing some more colours in this for my next purchase.

Only downside to this is there is only one colour in it!! Please do some more colours. I’d buy them all!!

New to this trail running thing. Thort I may get over hot in this t but it was perfect. It breathed perfectly

Love this shirt, but it is very fitted... I should have sized up! On the plus side my daughter loves it and wears it all the time now

This is great shirt, the logo on the back is really cool. It's probably a little thick for most QLD weather but great for the early morning runs in winter. It does not stink, ever! Tighter fit compared with the ultra tops.

This is my first ioMerino purchase. At first glance the shirt seems really thin and not as long as I hoped (I should have read the details they changed the fit) However still cute and will hopefully last through many training miles. Unfortunately I got hit with huge duty coming into a Canada (ioMerino did warn me about this) however it was $46 on top of an already very expensive shirt. (Warning for fellow Canadians!) So hopefully it will last forever! I am usually a size medium and ordered a medium. I would say shirt is TTS, I would love to see a little more added to the length however again overall pretty good. Shipping was very fast!