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Altitude Zip

Fabric Guide Size Guide

Men'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.

 

 Men's General Size Chart

 

 

XS

S

M

L

XL

XXL

Waist

Inch

27

28-30

32-34

36-38

40-42

44-46+

 

cm

68 - 70

71-76 

81-86

91-96

101-108

111-116+

Chest

Inch

32-34

34-36

38-40

42-44

46-48

50+

 

cm

81.5 - 86

86-91

96-101

106-111

116-121

127+

 

Tracksuit Pants 

Outside Leg measurement (including waist band).

Model height 6'2 , wearing a size medium. 

S M L XL XXL
Inside Leg inch 29 30  30.5 31 31.5
cm 74.5 76 77 78.5 80
Outside Leg inch 41 41.5 42 42.5 43
cm 105 106 107.5 109 110

 

Merino-Compression Leggings

Model height 6'3 , wearing a size large. 

XS S M L XL XXL
Inside Leg  inch 25.4 26.4 27.4  28.3 29.3 30.3
cm 64.5 67 69.5 72 74.5 77

 

Altitude Tights - Ready for Adventure

 Model is 6'2" and wears size medium. 

XS S M L XL XXL
Waist inch 25.0 26.9 28.8 30.7 32.6 34.5
cm 63.6 68.4 73.2 78.0 82.8 87.6
Hip inch 31.6 33.4 35.1 37.0 38.7 40.5
cm 80.4 84.8 89.4 94.0 98.4 103.0
Lower Hip inch 20.5 21.6 22.8 24.0 25.1 26.3
cm 52.0 54.8 57.8 61.0 63.8 66.9

 

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Black
XS
S
M
L
XL
XXL

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. The Men’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 Men'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.

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 6'2" and wears size large in black.

Size Guide. Contact Fit.

Snow Sports

Cycling

Running

170gsm lightweight

96% superfine Australian Merino

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

MicroMerino®  Fabric. 

BENEFITS OF MERINO

LIGHTWEIGHT
THERMO REGULATING
SUPER SOFT & COMFORTABLE
BREATHABLE
MOISTURE WICKING
ODOUR RESISTANT
NATURAL
ETHICALLY MADE

Customer Reviews

Based on 53 reviews
87%
(46)
6%
(3)
6%
(3)
2%
(1)
0%
(0)
E
Emma Tanzer (Adelaide, AU)
BEST winter warmth!

This is my second iomerino altitude zip, I absolutely love it and wouldn’t survive winter running without it. Super warm and gets me out on a 3 degree day at 5 am. Wouldn’t be without it ever. Cheers ioMerino keep up the good work 🌟

R
Renata Williams (Sydney, AU)
Altitude Zip top

I bought this top for my son for his cross country/winter running training. He stated it fits well is nice and warm and is extremely comfortable to wear. Highly recommended.

E
Erika (Melbourne, AU)
Bright and beautiful

I bought the Altitude Zip in bright rose, as my base layer ahead of some winter trail runs. I’m loving it. Wicks moisture beautifully, washes well, and the colour is gorgeous. Will be buying more.

H
Happy runner (Adelaide, AU)
Light and warm

Love my altitude zip, this is the second purchase. Pretty sure I’ll end up with one in each colour.
Comfortable, warm and light. Best of all no stink!

G
Geoff Mills

Awesome top my wife loves it as with all her io merino sports clothes. Very comfortable, no sweat, she loves running in it and also great for general wear in and out of the house

H
Heather (Melbourne, AU)
Comfortable and good-looking

Enjoying this top; I live in the Snowy Mountains and long sleeves while running are a must for half the year. Nice and warm and light





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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 - Celsius 

Made from 45% ultra fine MERINO (Ultra Lightweight 150gsm), 45% natural TENCEL (made from sustainably grown wood fiber), and 10% nylon for extra durability. 

 

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: