The Vivobarefoot Primus Trail Flow Waterproof Men's Barefoot Trail Shoe in Mole Print is designed for trail running, off-road adventures and natural movement in wet conditions. Combining a breathable waterproof membrane, lightweight recycled polyester upper and aggressive Soft Ground outsole, this flexible barefoot trail shoe delivers grip, ground feel and weather protection when the terrain gets challenging.
Key Features & Benefits
Waterproof protection: A breathable waterproof membrane, sealed seams and water-resistant materials help keep your feet dry in wet conditions.
Soft Ground outsole: A 1.8mm sole base with 5.5mm chevron-shaped lugs provides traction on muddy, loose and slippery terrain.
Foot-shaped toe box: Gives your toes room to spread naturally, supporting comfortable movement over uneven ground.
Zero-drop construction: Keeps the heel and forefoot level for a natural barefoot stance.
Lightweight upper: Recycled polyester mesh with stretch material provides flexibility and a secure fit.
Close-to-ground feel: Flexible underfoot construction without a removable insole maintains a direct connection to the terrain.
Water protection: Waterproof membrane and sealed construction
Weight: Approximately 310g per shoe (EU42)
Fit: Foot-shaped, zero-drop; true to size
Intended use: Trail running, muddy trails and off-road adventures
Who Is This Shoe For?
Ideal for trail runners and outdoor enthusiasts looking for a lightweight waterproof barefoot shoe with reliable grip on wet and muddy ground. The Primus Trail Flow Waterproof suits technical trails, forest paths and off-road exploration where flexibility, traction and natural foot movement matter.
Frequently Asked Questions
Is the Primus Trail Flow Waterproof fully waterproof?
Yes. It features a breathable waterproof membrane, sealed seams and water-resistant materials designed to help prevent water entering the shoe during wet-weather activities.
Is this shoe suitable for muddy trails?
Yes. The Soft Ground outsole uses 5.5mm chevron lugs to provide traction on loose, soft and muddy terrain.
Does the Primus Trail Flow Waterproof have a wide toe box?
Yes. Its foot-shaped design provides space for natural toe movement, while the zero-drop construction keeps your heel and forefoot level.
How does the Primus Trail Flow Waterproof fit?
Vivobarefoot describes this model as true to size. Consult the Vivobarefoot size guide and allow comfortable space in front of your longest toe.
Start with your regular size, regardless of the brand. If you are unsure what your size is, please check our guide below. If you are used to wearing regular shoes, Vivobarefoot may feel more spacious when you first start wearing them.
In the end, fit is personal but we’re here to help you on your path to barefoot freedom!
01.
FEET COME IN DIFFERENT SHAPES AND SIZES
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
For the most accurate fit refer to the size charts below.
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.
If you are still unsure about your size, visit our store for in-store measuring,