Vivobarefoot Primus Trail Knit FG Men's Trail Shoe – Ultimate Grey/Storm Cloud
Fast, versatile, and barefoot by design. The Vivobarefoot Primus Trail Knit FG in Ultimate Grey/Storm Cloud is a men’s trail running shoe built for hardpack adventures — a knit upper with sock construction, quick-lace system, and firm ground (FG) sole that balances barefoot sensation with multi-terrain grip for trail running, fastpacking, and hiking.
Features
- Knit upper with sock construction for flexibility and protection
- Firm Ground (FG) outsole for multi-terrain grip
- Quick-lace system for easy adjustments
- Wide toe box for natural toe splay
- Zero-drop sole for natural posture
- Men’s fit
- Ultimate Grey/Storm Cloud colourway
Specs
- Colour: Ultimate Grey/Storm Cloud
- Drop: Zero
- Outsole: Firm Ground (FG)
- Best use: Trail running, fastpacking, hiking
- Fit: Men’s
- Brand: Vivobarefoot
About Vivobarefoot
Vivobarefoot designs footwear that reconnects people with natural movement. Built wide, thin, and flexible, every shoe is designed to strengthen feet and restore the natural barefoot experience.
Vivobarefoot Men’s Size Chart
Ensure your Vivobarefoot shoes fit just right. Our guide includes accurate size conversions (cm, EU, UK, US), the “rule of thumb” for toe-splay, and easy 365-day returns.
Men’s Footwear Size Guide
| Foot Length (cm) | EU | UK | US |
|---|---|---|---|
| 26.2 | 40 | 6 | 7 |
| 26.9 | 41 | 7 | 8 |
| 27.6 | 42 | 8 | 9 |
| 28.2 | 43 | 9 | 10 |
| 28.9 | 44 | 10 | 11 |
| 29.5 | 45 | 11 | 12 |
| 30.2 | 46 | 11.5 | 12.5 |
| 30.9 | 47 | 12 | 13 |
| 31.5 | 48 | 13 | 14 |
| 32.2 | 49 | 14 | 15 |
The Rule of Thumb
Vivobarefoot deliberately fits larger—your toes need room to splay naturally. If you can fit your thumb between your longest toe and the shoe’s front, you're likely wearing the right size. Over time, as toes spread, you may need to move up a size.
How to Measure Your Feet
- Stand on a hard surface with your heel against a wall.
- Mark the tip of your longest toe and measure to the wall in cm.
- Use the measurement above to choose the corresponding EU/UK/US size.
- Measure both feet and use the longer measurement.
Sizing Tips & Returns
- Vivobarefoot shoes run larger than traditional footwear—don’t worry, this supports natural toe splay.
- If you’re between sizes, we recommend sizing up for comfort rather than over-tight fit.
- Changed your mind? Return unused shoes within 365 days for a full refund or store credit—no questions asked.
Vivobarefoot Primus Trail Knit FG Men's Trail Shoe – Ultimate Grey/Storm Cloud
Fast, versatile, and barefoot by design. The Vivobarefoot Primus Trail Knit FG in Ultimate Grey/Storm Cloud is a men’s trail running shoe built for hardpack adventures — a knit upper with sock construction, quick-lace system, and firm ground (FG) sole that balances barefoot sensation with multi-terrain grip for trail running, fastpacking, and hiking.
Features
- Knit upper with sock construction for flexibility and protection
- Firm Ground (FG) outsole for multi-terrain grip
- Quick-lace system for easy adjustments
- Wide toe box for natural toe splay
- Zero-drop sole for natural posture
- Men’s fit
- Ultimate Grey/Storm Cloud colourway
Specs
- Colour: Ultimate Grey/Storm Cloud
- Drop: Zero
- Outsole: Firm Ground (FG)
- Best use: Trail running, fastpacking, hiking
- Fit: Men’s
- Brand: Vivobarefoot
About Vivobarefoot
Vivobarefoot designs footwear that reconnects people with natural movement. Built wide, thin, and flexible, every shoe is designed to strengthen feet and restore the natural barefoot experience.
Vivobarefoot Men’s Size Chart
Ensure your Vivobarefoot shoes fit just right. Our guide includes accurate size conversions (cm, EU, UK, US), the “rule of thumb” for toe-splay, and easy 365-day returns.
Men’s Footwear Size Guide
| Foot Length (cm) | EU | UK | US |
|---|---|---|---|
| 26.2 | 40 | 6 | 7 |
| 26.9 | 41 | 7 | 8 |
| 27.6 | 42 | 8 | 9 |
| 28.2 | 43 | 9 | 10 |
| 28.9 | 44 | 10 | 11 |
| 29.5 | 45 | 11 | 12 |
| 30.2 | 46 | 11.5 | 12.5 |
| 30.9 | 47 | 12 | 13 |
| 31.5 | 48 | 13 | 14 |
| 32.2 | 49 | 14 | 15 |
The Rule of Thumb
Vivobarefoot deliberately fits larger—your toes need room to splay naturally. If you can fit your thumb between your longest toe and the shoe’s front, you're likely wearing the right size. Over time, as toes spread, you may need to move up a size.
How to Measure Your Feet
- Stand on a hard surface with your heel against a wall.
- Mark the tip of your longest toe and measure to the wall in cm.
- Use the measurement above to choose the corresponding EU/UK/US size.
- Measure both feet and use the longer measurement.
Sizing Tips & Returns
- Vivobarefoot shoes run larger than traditional footwear—don’t worry, this supports natural toe splay.
- If you’re between sizes, we recommend sizing up for comfort rather than over-tight fit.
- Changed your mind? Return unused shoes within 365 days for a full refund or store credit—no questions asked.
WHY GO BAREFOOT
Wearing Vivos for 6 months increases foot strength by 60%
Better Balance and Posture
Foot-shaped fit enables toes to splay supporting balance and a stable base of support.
Improved Coordination And Agility
Thin sole allows the thousands of nerve endings in each foot enabling the sensory feedback the brain needs to move with skill.
Improved Strength and Natural Movement
Flexible footwear let the muscles and tendons load and recoil, supporting stronger, more resilient feet over time.
20,000+ Reasons to Give Us a Try
At Adventureco, we stand behind every product we sell. That’s why you’re covered by our 365-Day Return Policy — with free returns within Australia.
Not the right fit? Changed your mind? No worries. Return your gear in unused condition within 365 days for a full refund or store credit — no fuss, no pressure.
Trusted for 10+ years and over 20,000 orders delivered. Shop with confidence, the adventure is guaranteed.