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.
The Primus Flow is the newest member of the Primus family, designed for pinnacle barefoot running performance. Built for efficient and unrestricted natural movement, this ultra-lightweight runner – our lightest ever – weighs in at just 150g. Its lightweight, breathable upper made from engineered recycled mesh forgoes overlays in favour of a stripped-back, seamless construction.
Mindfulness in motion
Embracemindfulrunningandfull-bodyconnection
Product Info
PRIMUS FLOW OUTSOLE
Embrace your human nature
NO INSOLE
No insole, bringing you even closer to the ground for the full barefoot experience.
BREATHABLE MESH
Breathable, lightweight and comfortable.
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.
WEIGHT
Based on a single shoe in Men's size: EU 42 | UK 8 | US 9
159g
MATERIALS & TRANSPARENCY
UPPER
100% recycled polyester jacquard
LINING
Unlined
LACES
100% recycled polyester
OUTSOLE
Midsole: ETPU (4mm), Outsole: 100% TPU (2mm)
MADE IN VIETNAM
Care
Cleaning
Brush off mud and clean with a damp cloth.
Drying
Remove insole and dry at room temperature. Keep out of direct sunlight and avoid putting on a radiator.
End of life
Once you can’t repair or don't need them anymore, send us your old Vivos and we’ll make they sure they’re given a second life, or if they’re really well-loved, we'll store them until we launch our recycling solution.
Run the way nature intended
Engineered to connect you with the ground and engage every muscle
The Primus Flow features an innovative 4mm midsole made entirely from low-density ETPU that’s designed to reduce the risk of injury without sacrificing proprioception. However, remember that barefoot running is a journey, not a race. To prevent injury, take it slow – learn how to stand, walk and squat barefoot first before attempting to run.
Fit, Feel, Flex
For natural stability, natural sensory feedback and natural strength.
PRIMUS FLOW OUTSOLE
The new Primus Flow outsole is a super lightweight 150g, crafted for speed and agility on runs. It delivers flexibility and grip, empowering stronger feet through a purposeful design that keeps you connected to the ground for more mindful running.
Sole base
1.4mm
Tread Depth
0.6mm
The ultimate barefoot experience.
Shoes that put fashion before fitness and money before wellness? The unnatural isn't working. It's time to get back to basics and let nature heal us.