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Altitude Zip

Fabric Guide Size Guide

Women's Size Chart

Click here to learn more about our different fits and how to choose the size that's right for you.

We strive to make all our products true to size. The sizing chart below is not garment specific, but hopefully, it will give you some guidance when choosing your size. In instances where you’re perhaps in between two sizes try choosing the smaller size.

For further assistance with sizing, contact us here.

 

XS

S

M

L

XL

Australian

6-8

8-10

10-12

12-14

14-16

US

2-4

4-6

6-8

8-10

10-12

European

34-36

36-38

38- 40

40-42

42-44

 

 

 

BUST

WAIST

HIPS 

XS

inches

29.5–32.5

23.5–26

33–35.5

cm

75-82.5

60-66

83.5-90

S

inches

32.5–35.5

26–29

35.5–38.5

cm

82.5-90

66-73.5

90-97.5

M

inches

35.5–38

29–31.5

38.5–41

cm

90-96.5

73.5-80

97.5-104

L

inches

38–41

31.5–34.5

41–44

cm

96.5-104

80-87.5

104 -111.5

XL

inches

41–44.5

34.5–38.5

44–47

cm

104-113

87.5-94.5

111.5-119.5

XXL

inches

44.5–48.5

38.5–42.5

47–50

cm

113-123

97.5-108

119-127

 

Stride Tracksuit pants

Measurements include the ankle cuff. Please keep in mind the style of these pants is slightly drop crotch. 
Outside leg measurement includes waist band.

Measurements in cm. 

 

XS

S

M

L

XL

Outside Leg

94.3

96.1

97.9

99.7

101.5

Inside Leg

66.4

67.6

68.8

70

71.2

 

Socks

Sizes give in US shoes sizes 

S 5.5 - 6.5
7 - 9
L 10 - 12
XL 13+

 

 

or make 4 interest-free payments of $19.25 fortnightly with More info

Black
Grey
Black/White Stitch
Navy
XS
S
M
L
XL

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.  

Ultra Trail Australia mandatory gear approved thermals.

Designed to be worn as a body tight ‘contact fit’ layer. 

Drop back hem and extra length in body. 

Thumb loops 

Zip Neck

True to size. Model is 5'10" and wears size small.

Size Guide. Contact Fit.

Snow Sports

Cycling

Running

170gsm lightweight

96% superfine Australian Merino

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

MicroMerino®  Fabric. 





Customer Reviews

Based on 22 reviews
77%
(17)
5%
(1)
14%
(3)
5%
(1)
0%
(0)
L
L.
Great top, but buy a size larger

This is a gorgeous top. The fabric is the perfect weight for a light running top on cold mornings and it is so comfy. It does run small though, so if you like a shirt that isn't body hugging, order a size larger.

R
R.D.
Great purchase

Was my first ever purchase of clothing online, great fit and excellent quality! I'm quite tall and lanky but fits great, perfect length

L
L.M.
Comfortable to wear

Very soft merino fabric makes this top so comfortable to wear. The sleeves are a generous length which is great for someone like myself who has long arms. Good length also. I wear this top under the io merino vest I purchased previously. All up io merino products keep me very warm. Thank you

K
K.
Ridiculous sizing

The Large is ridiculously tight, nothing like the other ioMerino top I already own. There is no consistency.
I am out of pocket for postage, it had to be returned.

Hi Katherine, Thank you for taking the time to review the Altitude Zip. Positive or negative, we are always interested to hear customer feedback. I am sorry to hear the Altitude Zip didn't compare to your previous purchase of the Ultra Zip. The Ultra and the Altitude Ranges are design to fit differently. The Altitude range is lot tighter fitting design to hug the body all over as a true base layer thermal. This style is great for layering in cold climates, as the tight fit keeps you extra warm. The Ultra Range is a regular fit, designed to skim the body and perfect for everyday. If you would like a slightly looser fit, size up in the Altitude Range. At this stage all returns for change of size or change of mind are at the expense of the customer. As a small business we are always working on way to improve and hopefully in the future we will have more options for customer return shipping. Please note we have issued you a full refund on your item. Normally sale items cannot be returns or exchanged for any reason, but we didn’t want you to be left with a product you could wear. I hope you continue to wear and enjoy your Ultra Zip. If you ever need any help with size or fits, please don’t hesitate to reach out to us at customerservice@iomerino.com
B
B.P.
Neckline

Disappointed with the Altitude Zip. Initially I had to exchange for a larger size as the neck was too tight. Now after the first wash the neck seems to have a twist in it and doesn't sit at all well unless zipped right to the top. I already have a Mongrel and an Ultra Zip and love both those. The neckline in the Ultra Zip is much nicer. Overall I love the tops as they are great to wear in the cold weather

Hi Barbara, Thank you very much for taking the time to leave a review on your Altitude Zip. I have a quick fix for the twist in the collar; the benefit of merino wool is that it has a natural shape memory. Merino wool has a natural ‘kink’ which means with steam, a light iron after washing, it will make it ‘bounce back’ to its original form and help the garment sits properly again. Glad to hear you're loving the mongrel and the Ultra Zip! Come back and shop with us again soon.
S
S.
Great for winter running

Warm and breathable. Glad I read the other reviews and sized up. The large is very close fitting even though I would be a medium normally.

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Fabric Guide

While Merino is an amazing natural fibre, not all Merino fabrics are created equal. At ioMerino, we make our own fabrics, using only the best quality fibres, and to very specific specifications that make the most of the natural benefits of Merino. All of them are 'Merino rich’. No cheap blends passed off as Merino. No cheaper scratchy fibres or synthetic substitutes to save money. No unethical production. And each fabric is made for a specific purpose. So if you see something with a small amount of elastase or nylon added, you can be sure it absolutely needs to be there to enhance the natural stretch and durability. 

It took every bit of our 140 years of experience in the wool industry to perfect our fabrics, but we think you’ll agree the end result was more than worth the effort.

Ethically Made. Ethically Sourced. Perfectly Natural. 

 

Altitude / Zodiac

Lightweight 170gsm 96% Australian Merino Wool with 4% elastane for extra stretch and comfort. A MicroMerino® Fabric. 

 

Ultra / Universal

Lightweight 160gsm 83% Australian Merino Wool blended with 12% nylon blended for extra durability and 5% Elastane for stretch and comfort.

 

Chaser

Midweight 265gsm 96% Australian Merino Wool with 4% elastane for extra stretch and comfort. A MicroMerino® Fabric. 

 

Summerino - Keystone 

Ultra Lightweight 150gsm 100% Australian Merino Wool. A MicroMerino® Fabric. 

 

Merino Compression

Midweight 280gsm 76% Australian Merino Wool, 15% Elastane and 9% Nylon for extra stretch and compression properties.

 

Vital

Ultra lightweight ribbed 155gsm 100% Australian Merino Wool. A MicroMerino®  Fabric. 

 

Summit

Outer Weight 280gsm Fleece 100% Australian Merino Wool. MicroMerino®  Fabric. 

 

Pinnacle

Midweight 260gsm 100% Australian Merino Wool. A MicroMerino®  Fabric. 

 

Elemental 

Midweight 260gsm waffle texture 100% Australian Merino Wool. A MicroMerino®  Fabric. 

 

Stride / Glacier / Velocity

Midweight 255gsm French Terry 100% Australian Merino Wool. A MicroMerino®  Fabric. 

 

Natural Merino Wool benefits: