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Altitude Crew

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Color
Black
Charcoal Marle
Raspberry
Imperial
Size

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 Women's Altitude Crew Neck Base Layer is the perfect go to thermal layer for just about any adventure and one of our all-time best sellers. It's the perfect thermal layer for core warmth when you're layering up, yet versatile enough to be worn on its own in milder conditions.

Tag-free, flatlock stitching and raglan sleeves help eliminate chafe and maximise comfort, and the drop back hem is  designed for tucking into your outer layers, or sitting over bottom layers, with no exposed cold spots when you're on the go. The thumb loops keep your hands warm and stop your sleeves riding and bunching under your arms when layering. This top is the perfect combination of performance, warmth and comfort.

Perfect for snow sports, cycling and running.

Made with 170gsm lightweight 96% superfine Australian Merino and 4% Elastane MicroMerino - for an easy four-way stretch and freedom of movement.

Ultra Trail Australia mandatory gear approved thermals.

SIZE & FIT

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. 

Drop back hem and extra length in body. New and improved slightly shorter length.

Thumb loops

True to size. 

Model wears a size small in Dark Khaki, Black, and Charcoal Marle.
Model specs - height 167cm, chest 78cm, waist 63cm, hips 81cm.

Model outdoors wears a size medium in Bright Rose.
Model in studio wears a size small in Bright Rose.
Model specs - size 8-10, height 170cm, chest 80cm, waist 67cm, hips 93cm.

Model wears a size medium in Gothic Grape, Moroccan Blue, and Gothic Grape / Pink.
Model specs - Chest 90cm, waist 70cm, hips 95cm.

Model wears size small in Green.
Model size 6-8, height 170cm, chest 81cm, waist 63.5cm, hips 89cm.

Model wears a size small in Raspberry.
Model specs - height 167cm, chest 78cm, waist 63cm, hips 81cm.

Model wears size medium in Imperial Blue, which appears looser than the intended fit.
Model specs - clothing size 6, height 173cm, chest 76.5cm, waist 58cm, hips 86cm.

Size Guide. Contact Fit. 

BEST FOR 

Snow sports

Cycling

Running

BENEFITS OF MERINO

LIGHTWEIGHT

THERMO REGULATING

SUPER SOFT & COMFORTABLE

BREATHABLE

MOISTURE WICKING

ODOUR RESISTANT

NATURAL

ETHICALLY MADE

  • 5 stars: 53 (96%)
  • 4 stars: 2 (4%)
  • 3 stars: 0 (0%)
  • 2 stars: 0 (0%)
  • 1 star: 0 (0%)
Some of the reviews shown are from related products the merchant grouped with this one.
S
Sylvie Bombardier (Sydney, AU)
Wonderful Service

I bought 3 io merino tops which are warm and lovely
I bought them on line
They were delivered by 5 working days plus I was kept up to date of when they were dispatched right up until they were delivered to my local post office
Well done io merino

H
Heather Waterfall (Adelaide, AU)
Love my attitude crew

Comfy and warm, great for cold morning runs. Sizing runs a bit small

K
Kat S (Brisbane, AU)
The warmest ever

I have a few "warm" underlayer pieces as I do feel the cold, but this one is definitely the best ever. I will be back for more next winter!

L
LissG (Sydney, AU)
Altitude Crew - beautiful tops

First time purchasing from IO and these tops are so beautiful, the range of colours are wonderful. So light and warm, love the length. Normally a size S/10 generally, but purchased L and happy with the fit as they are still body hugging but not tight. Super stylish. Will love wearing these.

J
Joan Tibballs

Warm, snug, great colour

M
Michele Murray (Melbourne, AU)
No skimping on fabric!

Love my merino - the fabric is luxurious on my skin and yay, lots of length in body and arms. Definitely my new go to for merino's

G
Grace I (Melbourne, AU)
Best Ever Merino wear

I have worn Merino for years with a big brand and trying Io Merino I can't look back, they are that good. Did not know what I was missing! The texture is smooth and beautiful, so comfortable and with durability to the fabric. The team at Io Merino are just fab if need to make contact and online ordering smooth and reliable process. Tip: I always wash Merino in wash bag to keep.as new and avoid snags in machine and handwashing is a great option too. I added two more colours as I live in Merino long sleeve tops in cooler weather bike riding or everyday wear as lightweight and warm and can layer easily without bulk to stay warm. So good having colours! and styles to choose from first time ever with Merino I have seen and to experience high end merino I never had before. Look forward to adding other styles for warmer weather..

T
Tamsyn Williams (Perth, AU)
Soft and comfortable

Purchased this top to wear while running in the cold during winter. I have been very happy with it so far - it is soft and comfortable and definitely keeps me warm. It is very thin and able to be worn under other clothing. Will be purchasing another one!

A
Alison (Melbourne, AU)

So comfy and warm. I am wearing it all the time underneath everything! Warm yet not bulky.

K
Kylie Rees
Love it!

This top is very warm yet thin enough to be worn under a fitted jacket. I have purchased 2 to date and am more than happy with the size and warmth.

d
diane clough (Brisbane, AU)
total warmth and comfort

Love this merino wear and the delivery was really prompt - lucky me as its been cold!

L
Libby Sharpe (Tenterfield, AU)
Soft and WARM

Excellant product - will be ordering more in the future

K
Kelly (Sydney, AU)

Excellent quality

M
Megan Skellington (Perth, AU)
Wardrobe essential

I bought this for chilly morning dog walks but it's quickly become my 'wear every day' top. Comfy under a jumper or even on its own. The raglan sleeves mean no itchy seams under my arm. I'll be getting more of these - it's an essential top for autumn/winter. Ethics and transparency are amazing (I only purchase from ethical and sustainable businesses).

P
Pat Kilby (Melbourne, AU)
ideal for all climates

I purchased this to have a different colour merino to my others. Perfect as a base layer and for just as is. Fit is as described and shown in the photo. Price is competitive. Best of all is Australian merino and made under ethical conditions which to me is a major criteria for purchasing.

J
Jessica Rucks (Melbourne, AU)
So soft

I love this top - i want every colour. Its so soft, and the sleeve length is perfect. Love!

K
Karen Probst (Melbourne, AU)
Wonderful again

Loved the mongrel I bought a couple of years ago. This one is just as comfortable, just as warm, now waiting for new colors in the mongrel to get another one

L
Lyndal (Sydney, AU)
I want more

I feel the cold and am always on the look out for comfortable, non bulky clothing to wear that will take me from inside to outside walking the dogs. I usually wear at least 3 layers plus a vest inside the house in winter, then put on an outer layer for walks. I prefer natural fibres for warmth and also to avoid microplastics in the environment. This top is brilliant! Its soft, comfy, doesn't get all sweaty and make me cold at the end of my walk. I'm pretty much planning on living in it for the rest of the winter. My medium is a perfect fit and I usually go a 10 or 12.

M
Megan Raggio (Adelaide, AU)
Toasty warm.

Love this base layer. I wear it as a warm layer over a tank when going out for my run. It's soft & warm. It also keeps me toasty warm without overheating or sweating when worn under a jumper on frosty morning walks.

S
Sharon Sprott (Launceston, AU)
Soft and warm

Bought an Altitude Crew on recommendation from my sister. It is just so comfortable to wear, the fabric is soft and it's a great warm layer. So impressed I bought a couple more!

For women looking for sizing: I'm an hourglass shape, usually but a 14 in tops. I bought an XL in women's fit and it's perfect. Nicely comfy, great next to skin layer on cold days.

T
Tamara Box (Sydney, AU)
Best base layer I’ve found!

I absolutely love my altitude crew for staying warm during early morning chilly winter trail runs or bike commutes to work. They wear really well over time as well, my first one is two years old and still looks like the new one I have just purchased.

A
Angelika Hala (Brooklyn, US)
Warm and Light

bought the Altitude crew and zip to layer but found that it did not work. The close to body fit made the sleeves quite snug around my upper arms, layering was not comfortable. Otherwise, absolutely lovely, very flattering if you feel comfortable in the contoured fit. Super light and super warm at the same time. Wore the crew running with just a light cheap down jacket in 22 F weather - warm enough!

L
Lizzie (Ballarat, AU)
Quality under-layer.

Very close fitting as described - Think body hugging! I am a size 16 and purchased an XL. If I wanted it as an outer layer, I would have gone for an XXL. Good quality and feel, and one of the few tops I can find with a Raglan Sleeve - Please give me more with Raglan sleeves - so much more comfortable on the move! Also, great customer service.

J
JJ (Brooklin, US)
great underlayer.

This is my first ever thumbhole shirt/jacket/whatever item and I was very excited to try it. It ends up not being great in this shirt as it will end up being an underlayer more than something i wear as a primary shirt. I forgot how close-fitting the altitude line is and should have ordered a size larger. This fits, but it fits CLOSE! that said, it stays in place well and feels good on. A bit thinner/cooler than I expected so i'll actually even get some summer wear out of it I think, if I can stand showing off everything I've got to the world. The thumb holes will make it easier to slide layers overtop without loosing my sleeves.

L
Lachlan Smith (Sydney, AU)
Cycling base layer

Overall happy with the fit and feel of my Altitude Crew. For cycling, arms are a bit long and thumb hole superfluous. Felt a bit tight first up, but has relaxed with a couple of washes. Sizing is generous. I'm usually an XXL, but XL is fine with this item. Have only used it in a Sydney winter, so no real test of it's warmth, but has been fine as a base layer on the bike so far.

P
Prefers subtle styling (Melbourne, AU)
Best top for outdoor exercise

Love this top for running and cycling in the cold. It regulates temperature really well and isn’t itchy like some wool is. The shape is well fitted and it’s great for layering

I
Ines nicholas (Hampton, AU)
Altitude Crew

Love these tops. Great as a layer or stand alone. Lovely colours also.

T
Terri Wieczorski (Hobart, AU)
Altitude Crew

Great to add to my collection of merino products, Australian made. Perfect base layer fits well, good sizing warm and colourful.

G
Ginnie (Adelaide, AU)
Love this top

I own a couple of them as they are such great tops. Love the fit, fabric, colours and ethic behind ioMerino.

J
Jeanie Wilson (Sydney, AU)
Great base layer top

Purchased this for hiking in winter. Great lightweight fabric. I am usually a size 8 and find the small is a very snug fit. Compared to other brands sizing is a bit smaller. Good colour choices and I would certainly purchase more.

C
Claire Jackson (Christchurch, NZ)

I really love my Merino and customer support was excellent. Sizing is tight and glad I bought a M instead of a small. Love the colour.

DETAILS

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 Women's Altitude Crew Neck Base Layer is the perfect go to thermal layer for just about any adventure and one of our all-time best sellers. It's the perfect thermal layer for core warmth when you're layering up, yet versatile enough to be worn on its own in milder conditions.

Tag-free, flatlock stitching and raglan sleeves help eliminate chafe and maximise comfort, and the drop back hem is  designed for tucking into your outer layers, or sitting over bottom layers, with no exposed cold spots when you're on the go. The thumb loops keep your hands warm and stop your sleeves riding and bunching under your arms when layering. This top is the perfect combination of performance, warmth and comfort.

Perfect for snow sports, cycling and running.

Made with 170gsm lightweight 96% superfine Australian Merino and 4% Elastane MicroMerino - for an easy four-way stretch and freedom of movement.

Ultra Trail Australia mandatory gear approved thermals.

SIZE & FIT

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. 

Drop back hem and extra length in body. New and improved slightly shorter length.

Thumb loops

True to size. 

Model wears a size small in Dark Khaki, Black, and Charcoal Marle.
Model specs - height 167cm, chest 78cm, waist 63cm, hips 81cm.

Model outdoors wears a size medium in Bright Rose.
Model in studio wears a size small in Bright Rose.
Model specs - size 8-10, height 170cm, chest 80cm, waist 67cm, hips 93cm.

Model wears a size medium in Gothic Grape, Moroccan Blue, and Gothic Grape / Pink.
Model specs - Chest 90cm, waist 70cm, hips 95cm.

Model wears size small in Green.
Model size 6-8, height 170cm, chest 81cm, waist 63.5cm, hips 89cm.

Model wears a size small in Raspberry.
Model specs - height 167cm, chest 78cm, waist 63cm, hips 81cm.

Model wears size medium in Imperial Blue, which appears looser than the intended fit.
Model specs - clothing size 6, height 173cm, chest 76.5cm, waist 58cm, hips 86cm.

Size Guide. Contact Fit. 

BEST FOR 

Snow sports

Cycling

Running

FABRIC - ALTITUDE

170gsm lightweight

18.5 microns

96% superfine Australian Merino

4% Elastane - for an easy all-way stretch.

A MicroMerino® Fabric.