Millions of years of evolution have done an amazing job. The human foot is perfectly designed for standing, walking, and running.
Remarkably, feet come in all sorts of shapes and sizes. Some have been compromised by a lifetime in conventional shoes, some naturally wider and some thinner and longer. We’re confident you’ll find a pair of Vivos to suit you.
02.
HOW TO MEASURE
Make sure you measure your feet standing up, not sitting down, and we recommend you do this later in the day, as feet tend to expand from when we first wake up.
Place a piece of paper larger than your foot against the wall. Ensure that the wall is flat, and if there is any skirting, it is also flat.
Stand on the paper with your heel against the wall. Ensure that the floor is hard and that the paper does not slide under any gap between the floor and the wall/skirting.
Mark the paper where your longest toe reaches with the pencil. Remember to not tuck the pencil under the toe as you want an accurate maximum measurement.
Measure the distance from the end of the paper to the toe line with a ruler or tape measure.
Repeat with your other foot, they might be different – trust us on this one! – and then use the longest measurement.
Use our conversion tables below to work out your recommended fit.
ADULTS
WOMENS FOOTWEAR SIZE GUIDE
FOOT LENGTH (CM)
EU
UK
US
21.2 - 22.1
35
2.5
4.5
22.2 - 22.8
36
3
5
22.9 - 23.5
37
4
6
23.6 - 24.1
38
5
7
24.2 - 24.8
39
6
8
24.9 - 25.4
40
7
9
25.5 - 26.1
41
8
10
26.2 - 26.8
42
8.5
10.5
26.9 - 27.4
43
9
11
MENS FOOTWEAR SIZE GUIDE
FOOT LENGTH (CM)
EU
UK
US
24.6 - 25.5
40
6
7
25.6 - 26.2
41
7
8
26.3 - 26.9
42
8
9
27.0 - 27.5
43
9
10
27.6 - 28.2
44
10
11
28.3 - 28.9
45
11
12
29.0 - 29.6
46
11.5
12.5
29.7 - 30.3
47
12
13
30.4 - 30.9
48
13
14
31.0 - 31.6
49
14
15
31.7 - 32.3
50
15
16
32.4 - 33.0
51
16
17
KIDS
TODDLERS FOOTWEAR SIZE GUIDE
FOOT LENGTH (CM)
EU
UK
US
9.4 - 10.2
18
2
3
10.3 - 10.9
19
3
4
11.0 - 11.6
20
4
5
11.7 - 12.3
21
4.5
5.5
12.4 - 13.0
22
5
6
13.1 - 13.6
23
6
7
13.7 - 14.3
24
7
8
PRESCHOOL FOOTWEAR SIZE GUIDE
FOOT LENGTH (CM)
EU
UK
US
14.4 - 14.9
25
8
9
15.0 - 15.6
26
8.5
9.5
15.7 - 16.3
27
9
10
16.4 - 17.0
28
10
11
17.1 - 17.6
29
11
11.5
KIDS FOOTWEAR SIZE GUIDE
FOOT LENGTH (CM)
EU
UK
US
17.7 - 18.3
30
11.5
12
18.4 - 19.0
31
12
13
19.1 - 19.6
32
13
1
19.7 - 20.2
33
1
2
20.3 - 20.9
34
2
3
JUNIOR FOOTWEAR SIZE GUIDE
FOOT LENGTH (CM)
EU
UK
US
21.0 - 21.7
35
3
4
21.8 - 22.4
36
3.5
4.5
22.5 - 23.1
37
4.5
5.5
23.2 - 23.8
38
5
6
23.9 - 24.4
39
6
7
04.
FITTING
Measuring your feet will help tell us what your recommended fit is. However, some like a shorter, snug fit while others prefer a longer, more spacious fit. This is where personal choice comes in.
It’s also important to note there will be slight variations in size from one style to another. Please check the product page to check if a style runs large, small or true to size.
RECOMMENDED
SNUG
This shows how a shoe would fit snug. It’s still a correct fit, but with less space around and at the front of the toebox.
RECOMMENDED
This is the shape of the recommended fit of Vivos. Remember, it might not be your preferred fit.
SPACIOUS
If you prefer a roomier fit or think you have wider-than-average feet, you might consider going a size up.
Don't battle the elements. Embrace them. The Primus Trail All Weather III Firm Ground is a versatile, water-resistant trail running trainer for extreme conditions and terrains.
For further information about the fit of this Vivo, see the Size & Fit drop-down below.
Rewild the run
Allweather,allterrainbarefoottrailtrainers
Product Info
FIRM GROUND OUTSOLE
Stand firm on multiple terrains.
ORTHOLITE INSOLE
The Active Ortholite Performance Insole is made of 98% recycled PU foam, which helps reduce waste and the use of virgin plastics.
TOUGH RUBBER COMPOUND
Strong, non-marking rubber compound for sticky grip and high-abrasion when you need it most.
VEGAN*
*The main materials in all our Vegan* products are synthetic and aren’t derived from animals. We don’t (yet) have the transparency we need over the production of all the small components (such as adhesives and dyes) used in these products to ensure they meet vegan best practices. So, whilst we believe the shoes are vegan, we’re not yet able to guarantee it and want to be fully transparent.
ALL WEATHER
Made using water-resistant constructions and non-absorbent materials.
WATER RESISTANT
Made from materials that are water resistant and materials that are non-absorbent.
WEIGHT
Based on a single shoe in Men's size: EU 42 | UK 8 | US 9
315g
Size & Fit
This Vivo fits small, so we suggest moving one size up. If you use StrutFit to get a recommended size, it will automatically factor this in. There’s no need to size up twice.
Remove insole and dry at room tempreture. Keep out of direct sunlight and avoid putting on a radiator.
Aftercare
LIQUIPROOF PREMIUM PROTECTOR. With wear, your shoes may loose some water resistent quality that is applied to the textile of the shoes. This product can be used to replenish the water repellent qualities.
The Revivo Take Back program is our initiative to extend the lifetime of our shoes and keep them out of landfill. Customers in the UK, US and Europe can send us your worn Vivos for free. Sorry global Barefooters, we’re working on expanding free shipping for our Take Back program to more regions, and eventually, make this available worldwide.
Swap pavements for peaks
Built for barefoot running, on and off-trail, whatever the weather
The Primus Trail III All Weather Firm Ground is for wild runners who don't stick to the path. An evolution of our original Primus Trail, designed to get down and dirty in tough, off-trail terrains and colder conditions. Made using a recycled, water-resistant mesh textile that's quick to drain and dry, with a snug collar fit that keeps grit and debris out, while letting all the feeling in.
multi-terrain
Giving you grip and ground feel on everything from wet and dry, rocky and firm terrain.
Urban
Stripped-back soles for barefoot living — so you're never too far from nature, even in the city.
Fit, Feel, Flex
For natural stability, natural sensory feedback and natural strength.
FIRM GROUND OUTSOLE
The Firm Ground Outsole is made from a sticky rubber compound for maximum grip and durability. With a 3mm base and 2.5mm lug height, plus a textured arch for zonal grip (ideal for technical trail movement), this sole will keep your feet firmly planted on multiple terrains — wet to dry, concrete to rocky.
Sole base
3mm
Tread Depth
2.5mm
Welcome back the wild.
Human beings aren’t separate to nature, we are nature. When we listen to it's rhythm and connect to its intelligence, we thrive. It's time to get outside and rewild.