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Altitude 'Mongrel'

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

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Dark Blue Marle
Charcoal
Blue
S
M
L
XL
XXL

If you’re looking to add a little extra fun to your next adventure, the Men’s Altitude ‘Mongrel’ is for you! Don’t let the name fool you, this is one seriously good thermal Base Layer. The perfect combination of performance, warmth and comfort with a little bit of fun thrown in for good measure.  

Get in quick, all Mongrels are strictly limited edition and once they're gone, they're gone for good. 

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. 

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. Slightly looser than the Altitude long sleeve styles.

Thumb loops 

Model is 6'2" and wears size large. 

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 6 reviews
83%
(5)
17%
(1)
0%
(0)
0%
(0)
0%
(0)
T
T.V.
iO Merino

I just love the soft feel of the top on my skin. It provides warmth but is extremely lightweight. I’m a keen hiker so the tops reduce the weight in my pack as well as providing quality products that keep me warm but don’t smell.

Thanks for your review! We're glad you love it
B
B.G.

I really like this top. Feels great. Comfortably warm in cooler conditions. Oh, and it looks great too. A refreshing addition to my trail running gear. Will get lots of use.

Thanks for your kind words Brian. Looking great and feeling good, that's what we like to hear!
R
R.C.

Great shirt, performs well in a range of temperatures. Comfortable through long events and looks good

Looks good, feels good! Cant ask for more than that. Thanks for letting us know how you're finding your new gear Rob, we really appreciate it!
S
S.H.

Loving the Mongrel. The quality from io is amazing. However the fit is a bit larger than expected. I will be sending it back for a smaller size. The customer service is absolutely fantastic. Thanks. Look forward to reviewing the smaller size

B
B.
Love it.

I have the earlier version of this shirt and love it. My favorite thing about it is that it performs well on the mountain and then looks good enough to wear socially afterwards. I wish more companies made things that worked well on the mountain and looked good enough to go out in for apres!

s
s.
great shirt

i have had this for about a month now and have been wearing it as my "casual" shirt on the weekends..today i wore it on a 10 mile bike ride underneath my anorak and it was the perfect combination...this shirt is awesome in both style and function...never lose the sleeves with thumbholes and please make this in some brighter colors..one in different blues such as turquoise/blue ringed octopus/ cerulean blue with grey and black and perhaps one in hulk purple and green..trust me on this there a lot of guys who are really tired of muted colors or only four colors...black/desert tan/coyote/ranger green...thanks





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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: