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 then we recommend you take the size up.

For further assistance with sizing, contact us here.

Women's Size Conversion Chart

	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

Altitude Range - 'Contact Fit'

The Altitude range is designed to be a tight, but comfortable, fit. If you size up it will give you a little extra room, but it will still hug your body as that’s what this range is designed to do. If you want a looser fit consider the Ultra or Universal range.

		XS	S	M	L	XL	XXL
Bust	inch	30-32	32-34	34-37	37-40	40-42	42-45
Bust	cm	76-82	82-88	88-94	94-100	100-107	108-114
Waist	inch	24-26	26-28	28-30	30-32	32-35	35-38
Waist	cm	58-64	64-70	70-76	76-82	82-89	89-96
Hips	inch	34-36	36–38	38-40	40-42	42-44	44-47
Hips	cm	84-90	90-96	96-102	102-108	108-115	115-122

Universal and Ultra Range - 'Regular Fit'

These garments are designed true to size, but going up a size in the Ultra will give it a slightly looser fit, whilst remaining sporty. The Universal is already designed as a more casual fit.

		XS	S	M	L	XL	XXL
Bust	inch	29.5–32.5	32.5–35.5	35.5–38	38–41	41–44.5	44.5–48.5
Bust	cm	75-82.5	82.5-90	90-96.5	96.5-104	104-113	113-123
Waist	inch	23.5–26	26–29	29–31.5	31.5–34.5	34.5–38.5	38.5–42.5
Waist	cm	60-66	66-73.5	73.5-80	80-87.5	87.5-94.5	97.5-108
Hips	inch	33–35.5	35.5–38.5	38.5–41	41–44	44–47	47–50
Hips	cm	83.5-90	90-97.5	97.5-104	104 -111.5	111.5-119.5	119-127

Women's Summit Zip Hoodie

Measurements in cm.

Measurements include ribbed hem.

Sleeve length from pit to hem.

	XS	S	M	L	XL	XXL
Pit to pit	41.4	45.2	49	52.8	56.6	60.4
Torso Length	60.5	63	65.5	68.1	70.6	73.2
Sleeve Length	47.9	50.5	53	55.5	58.1	60.6

Women's Stride Tracksuit pants

Measurements do not include the ankle cuff.

Please keep in mind the style of these pants is slightly drop crotch.

Measurements in cm.

	XS	S	M	L	XL	XXL
Waist	72.4	77.2	82	86.8	91.6	96.4
Hip	98.2	104	108.8	113.6	118.4	123.2
Leg Length	56.4	57.6	58.8	60	61.2	62.4

Women's Freedom Sweatpant

Outside leg measurement includes waist band.

Measurements in cm.

	XS	S	M	L	XL	XXL
Waist	68.4	73.2	78	82.8	87.6	92.4
Hip	94.4	99.2	104	108.8	112.6	118.4
Outside Leg	95.6	96.8	98	99.2	100.4	101.6

Women's Pace Compression Leggings - Original

Measurements in cm.

	XS	S	M	L	XL	XXL
Waist	72.4	77.2	82	86.8	91.6	96.4
Hip	98.2	104	108.8	113.6	118.4	123.2
Inner Leg Length	60.5	63	65.5	68.1	70.6	73.2

Women's Pace Compression Leggings

Measurements in cm.

	XS	S	M	L	XL	XXL
Waist	72.4	77.2	82	86.8	91.6	96.4
Hip	98.2	104	108.8	113.6	118.4	123.2
Inner Leg Length	60.5	63	65.5	68.1	70.6	73.2

Women's Pace 3/4 Compression Leggings

Measurements in cm.

	XS	S	M	L	XL	XXL
Waist	72.4	77.2	82	86.8	91.6	96.4
Hip	98.2	104	108.8	113.6	118.4	123.2
Inner Leg Length	42.2	44.8	47.3	49.8	52.4	54.9

Women's Pace Bike Shorts

Measurements in cm.

	XS	S	M	L	XL	XXL
Waist	72.4	77.2	82	86.8	91.6	96.4
Hip	98.2	104	108.8	113.6	118.4	123.2
Inner Leg Length	10.5	13	15.5	18.1	20.6	23.2

Women's Yoga Pants

Measurements in cm.
Outer Leg Length includes from the top of the waist to the bottom of the pant leg.

	XS	S	M	L	XL	XXL
Waist 1/2 measurement	34	36.5	39	41.5	44	46.50
Hip 1/2 measurement	40	42.5	45	47.5	50	52.5
Outer Leg Length	106.8	108	109.2	110.4	111.6	112.8

$120.00

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DETAILS
SIZE & FIT
BEST FOR
FABRIC - ALTITUDE

DETAILS

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 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.

SIZE & FIT

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

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

Model wears size medium in Black.

Model is 5'10" and wears size small in Charcoal Marle.

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

Size Guide. Contact Fit.

BEST FOR

Snow Sports

Cycling

Running

FABRIC - ALTITUDE

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

Altitude Zip

Love this top - it fits perfectly and is a magnificent colour. Thankyou io

iomerino Altidude

Great top, love it, modern and stylish, light and warm. I had a faulty zip on first order but company very quickly sent me another free of charge and postage. That was great i hadn’t expected that Great service and reputation. Thankyou

Love this!

Fits well, high quality, very impressed.

Love it

Comfortable, soft, not stinky. Exactly what I expected, it’s a skin fit - as described. I’m a size 10 usually and got a size small - it fits like the pics. My only improvement would be if you could put those slots in the arm so you can poke your watch through when running, the sleeves are hard to pull over my watch.

Winter warmth

Light, body hugging, gorgeous colours and collar gives that extra neck warmth low cuts lack

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 🌟

1 2 3

Instagram

Awesome

One of my specific reasons for buying the polo, apart from wearing it casually, I wear it under my yellow protective clothing as a volunteer firefighter. It is extremely comfortable in very hot conditions as it does not stick to your skin when sweating heavily and with the wicking ability helps with managing my body heat. Being wool it also gives that second level of protection against burn injuries.

D.L.

03/25/2023

Universal Polo

foot huggers

The socks are soft, comfortable and fit like a glove, a perfect sock to wear with boots.

D.L.

03/25/2023

Hiking Socks

Amazing!

I have stopped wearing leggings under my skirts for awhile now because of all the synthetic fibers and I decided to get these after a very long search to find the best. After about 1.5 months of searching and reading reviews I decided to get these. I followed the size guide and I found a perfect fit, I never want to take them off. Now I wear long, mostly ankle length skirts and I run in them so I sweat and I sweat a lot but these are amazing. I also have very stretched out skin from having children and these really hold things tight so my skin doesn't hurt when I run or itch. So pleased! I'm super excited to get a second pair but I need to save a bit for them. They also keep their shape after a couple days. I'm so thankful!

Customer

03/23/2023

Pace Compression Leggings - Original

Comfy undies

Fantastic undies for hiking and love the hot pink

Teresa Ukrainetz

03/22/2023

Altitude Brief - Ready For Adventure

Excellent - Love wearing the yoga pants

Great fit, fabric is light and warm
Very comfortable for travelling on long haul flights
Nice to relax around the home in too

Donna

03/21/2023

Yoga Pants

Great trackies

These track pants are a delight to wear. They are light comfortable and easy to wear during any activity. They also wash well. Also smart enough to wear while just out and about.

BRYAN CULLUM

03/21/2023

Stride Tracksuit Pants

Perfect for travel

These yoga pants were perfect for my recent trip to the UK. Comfortable all the way during the long flight and perfect for the cold weather there on arrival. I wore them the whole time I was away and they didn’t crease, lose shape or go baggy in the knees! Am about to buy another pair…

Jillian

03/21/2023

Yoga Pants

Comfort & Style

Beautiful fit. Very comfortable. Bought the set and pleased I did.

Deirdre

03/20/2023

Freedom Sweatpant

Perfection

True to size. Ultra comfortable. Perfect colour match to pants. Super pleased.

Deirdre

03/20/2023

Freedom Sweatshirt

truly excellent underwear

comfy, wicking, long-wearing, dry fast, look great - what else do you need?

CKA

03/17/2023

Ultra Trunks

Great fit, feels good will definitely buy another

Janis

03/17/2023

Universal Tee

the best trunks on the market

being an avid supporter of the merino industry and io merino product i purchased 3 pairs of the mens trunks about 12 months ago- it was not long before i dreaded wearing the cotton brands i was wearing prior to that. I then purchased enough IO mens trunks to ensure i had 100% comfort 100% of the time.

martin moses

03/16/2023

Ultra Trunks

Fabulous hoodie and amazing service!

I’ve been after a good hoodie for a while and had my eye on this. I bit the bullet on Monday, called up, got great service over the phone and when I got home from work today it had arrived! The hoodie itself is feels so soft, fits great and the quality is amazing. Now considering buying a different color! Thanks IO!

R.D.

02/08/2023

Summit Zip Hoodie

New Running Long Sleeve

Only used a couple of times but it’s great. Comfortable fit keeps me warmer than a t shirt and the thumb holes help keep fingers warmer on frigid hills mornings. Time will tell for durability. Love the colour (mint I think)

colin green

01/23/2023

Ultra Crew Neck

No Show Socks

Most comfy socks I’ve ever worn - love wearing them

Jules D

01/22/2023

No Show Socks

Altitude Zip