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Altitude Zip

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Color
Forest Marle
Moroccan Blue
Slate Marle
Green
Bright Rose
Dark Khaki
Black
Gothic Grape / Pink
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 Zip Base Layer thermal takes natural temperature regulation to a whole new level. It is the perfect ‘go to’ thermal layer for just about any adventure, especially if you’re expecting to hit a range of temperatures. Zip down when it’s mild, zip up and thumb loops on when the temperature drops.  The high collar also offers an extra level of warmth beyond the Women's Altitude Crew Neck Base Layer version of this top.

Flatlock stitching, raglan sleeves and tag free to eliminate chafe and maximize comfort. The drop back hem and extra body length is designed for tucking into your outer layers. Thumb loops keep your hands warm and stop your sleeves riding up when layering.

This Base Layer Thermal top is the perfect combination of performance, warmth and comfort.  

(For a more relaxed fit try our Ultra Zip.)

Ultra Trail Australia mandatory gear approved thermals.

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. 

Thumb loops 

Zip Neck

True to size. 

Model wears size small in Forest Marle.
Model height 171 cm. Normally wears top size 8-10, pant size 8-10, 6.5-7 size shoe.

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

Model wears a size medium in Moroccan blue, Gothic Grape / Pink and Gothic Grape.
Model specs - Height 164cm, chest 90cm, waist 70cm, hips 95cm.

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

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

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 67 reviews
87%
(58)
4%
(3)
6%
(4)
3%
(2)
0%
(0)
G
Graham

Toby I spoke to was fantastic
If I order again he will take my order.
Purchased 6 items all good however 1order was for xs but sent medium
Not impressed
Graham Tucker

Hi again Graham,

As discussed, quite happy to pass on a post paid label to get that one back to us.

If you do, we can get the correct sized one sent out to the UK for you.

All the best,
Coby

C
Carron

I ordered the medium size and it’s more like a small size, it’s a lovely colour thought

M
Miriam Stewart Taylor (Sydney, AU)
What’s not to love io ….oui oui

Excellent warm light washable wool, * very cool style and cut cut Perfect layer, Size 8 perfect fit, I love the look high neck zip and The fitted panels, a great colour which is so hard to find, I brought one last year, And got another just now,

J
Jordan (Perth, AU)
Such great quality

This top is just as pictured. It is so flattering! The material is extremely soft and it's nice enough to wear as a top without covering it up under your other layers.

LOVE IT

K
K.E. (Sydney, AU)
Altitude zip

Great top. Bought to wear under my ski jacket. Warm and comfortable. I sized up to a medium after reading the reviews and it fits perfectly (all my other iomerino gear is size S).

J
Joanne (Sydney, AU)
great quality but runs very small

Awesome quality as always from IO however I would suggest going up 1-2 sizes. I'm usually a medium which was more like a size 8. I exchanged for a size L however an XL would have perhaps allowed me to wear a tshirt underneath. I don't think anyone over a standard size 16 would fit this style (altitude).

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