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 charts below are general and 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 take a look at our recommendations below.
For further assistance with sizing, contact us here.
If for some reason you are not 100% satisfied with the size you chose, we’ll happily offer an exchange, refund or store credit on any non-sale garments. For more about our refunds and exchange policy, click here.
|
|
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+ |
Measurements in cm.
Measurements include ribbed hem.
Sleeve length from pit to hem.
XS |
S |
M |
L |
XL |
XXL | |
Pit to pit |
47.4 |
51.2 |
55 |
58.8 |
62.6 |
66.4 |
Torso Length |
65.9 |
68.5 |
71 |
73.5 |
76.1 |
78.6 |
Sleeve Length |
50.2 |
52.1 |
54 |
55.9 |
57.8 |
59.7 |
Measurements in cm.
Measurements include ribbed hem.
Sleeve length from shoulder to cuff.
XS |
S |
M |
L |
XL |
XXL | |
Pit to pit |
49.4 |
53.2 |
57 |
60.8 |
64.6 |
68.4 |
Torso Length |
68.9 |
71.5 |
74 |
76.5 |
79.1 |
81.6 |
Sleeve Length |
74.2 |
76.1 |
78 |
79.9 |
81.8 |
83.7 |
Outside Leg measurement (including waist band).
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 |
Outer leg length measure from top of waist to ankle.
Measurements in cm.
XS | S | M | L | XL | XXL | |
Waist | 58.9 | 64 | 69.1 | 74.2 | 79.2 | 84.3 |
Hips | 68.9 | 74 | 79.1 | 84.2 | 89.2 | 94.3 |
Outer Leg | 90.3 | 93.5 | 96.7 | 99.8 | 103 | 106.2 |
Leg length measurement includes ankle cuff.
XS | S | M | L | XL | XXL | |
Waist | 70.4 | 75.2 | 80 | 84.8 | 85.6 | 94.4 |
Hips | 82.4 | 87.2 | 92 | 96.8 | 101.6 | 106.4 |
Leg Length | 81.6 | 82.3 | 83 | 83.7 | 84.4 | 85.1 |
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 |
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 |
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 |
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 |
cm | 84-90 | 90-96 | 96-102 | 102-108 | 108-115 | 115-122 |
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 and Horizon are 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 |
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 |
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 |
cm | 83.5-90 | 90-97.5 | 97.5-104 | 104 -111.5 | 111.5-119.5 | 119-127 |
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 |
Measurements in cm.
Measurements include ribbed hem.
Sleeve length from shoulder to cuff.
XS |
S |
M |
L |
XL |
XXL | |
Pit to pit |
44.4 |
48.2 |
52 |
55.8 |
59.6 |
63.4 |
Torso Length |
62.9 |
65.5 |
68 |
70.5 |
73.1 |
75.6 |
Sleeve Length |
68.2 |
70.1 |
72 |
73.9 |
75.8 |
77.7 |
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 |
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 |
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 |
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 |
60.5 | 63 | 65.5 | 68.1 | 70.6 | 73.2 |
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 |
60.5 | 63 | 65.5 | 68.1 | 70.6 | 73.2 |
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 |
42.2 | 44.8 | 47.3 | 49.8 | 52.4 | 54.9 |
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 |
10.5 | 13 | 15.5 | 18.1 | 20.6 | 23.2 |
All sizes are given in US Sizing
Men's | Women's | |
S | 4 - 6 | 5.5 - 7.5 |
M | 7 - 10 | 8.5 - 11.5 |
L | 11 - 14 | 12 - 15.5 |
Measurement given for bicep width and arm warmer length. Measure around the fullest part of your upper arm in a relaxed position.
Use the chart below to determine your size. If you’re between two sizes, order the smaller size for a tighter fit or the larger size for a looser fit.
Approximate measurements only.
Bicep | Arm Warmer Length | |
XS | 27 - 28 cm | 45 cm |
S | 29 - 30 cm | 46.5 cm |
M | 31 - 32 cm | 48 cm |
L | 33 cm + | 49.5 cm |
Hand Length - Measure from the top of your middle finger to the base of the palm.
Use the chart below to determine your size. If you’re between two sizes, order the smaller size for a tighter fit or the larger size for a looser fit.
Pace Gloves:
S | 16 cm |
M | 18 cm |
L | 20 cm |
To measure your head circumference, take a sewing measuring tape and wrap around your head so that the measuring tape winds just above the ears, in the middle of your forehead and in the centre back of your head.
Use the chart below to determine your size. If you’re between two sizes, order the smaller size for a tighter fit or the larger size for a looser fit. Approximate measurements only.
Head circumference | |
S/M | 50-60 cm |
M/L | 60-70 cm |
For further assistance with sizing, contact us here.
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The Universal T-shirt is the perfect casual-fit Merino Tee for everyday wear, but doubles as a high-performance layer for your next big adventure. Lightweight, breathable, and odour-resistant. A true all-rounder.
Using our extra durable Merino+ fabric, the Universal Tee is packed with technical features to keep you safe and comfortable through all sorts of activities and weather conditions. With a similar relaxed fit to our best-selling Keystone Tee, while the Universal tee looks like regular casual Merino T-Shirt, it's a true high performance, lightweight, thermo-regulating layer.
When you’re travelling, exploring or doing any sort of high-intensity activity, it will keep you comfortable for longer through a wide range of conditions. Chilly start lines, full sun, shade, cool breeze and well past sunset will be no problems!
Designed with a regular, casual fit similar to our best-selling Keystone tops.
True to size.
Model wears size medium in Pink.
Model specs - height 164cm, chest 90cm, waist 70cm, hips 95cm.
Model wears size small in Black, Silver Pine, and Chilli.
Model specs - height 167cm, chest 78cm, waist 63cm, hips 81cm.
Model wears size small Charcoal and Patriot Blue.
Model specs - height 169cm, chest 78cm, waist 63cm, hips 73cm.
Hiking
Camping
Running
Lightweight 160gsm
83% superfine Australian Merino Wool
12% Nylon for extra durability
5% Elastane for an easy all-way stretch
I am hiking the Appalachian Trail and have been wearing IO Merino all the way! I started in a Run all the Trails shirt that I wore for the first 109 days. My backpack rubbed a few holes eventually - to be expected when you wear it every day and your pack weighs over 10kg.
I am now in my How good is Nature? Shirt and I just love it!
Thank you so much for your wonderful review Hannele :)
What an amazing journey! So glad you decided to go with io.
Looks good, feels soft, light and easily packable.
I washed it in the sink and it dried hanging in my bathroom in 5 hours.
I’m a size 12 Aus in almost everything or a medium and the medium in this fits comfortably.
I have already ordered another Universal top and two tanks tops and a bra for my upcoming 6 week trip. I like that not all of the tops look super outdoorsy so are more city travel friendly.
True to size. Comfortable, soft merino fabric. Holds size after gentle wash.
Great fit, feels good will definitely buy another
As soon as you put it on you feel comfort straight away. So worth it and I love to message on it.
Liked my first one so much I bought another one!
Got questions about what item will fit you best or which fabric is most suitable for your adventures? We’ve developed a quick guide to help make choosing the perfect layer easy.
“ I can honestly say your products are at least 25% better than (that other brand). And I’m a Kiwi. Not to mentioned feeling better about Fiji production and the fact that your cuts fit me better. The weaves are also finer and feel softer. Good on you and please share this with your team. I love supporting you! Heaps good.”