Vivobarefoot Primus Trail Knit FG Grounding Men's Barefoot Trail Shoe – Obsidian/Obsidian
Made for trail running, the Vivobarefoot Primus Trail Knit FG Grounding Men’s in Obsidian/Obsidian is also excellent for fastpacking and hiking. Its low profile and versatility make it a popular choice wherever outdoor lovers tread. A knit upper brings flexibility and protection, the quick-lace system means easy adjustments, and the thin Firm Ground sole balances barefoot sensation with grip — feeling fast on varied hardpack terrain and building natural strength with every step.
Features
- Vamp knit upper from 81% RPET, 10% Nylon Hotmelt and 9% Elastane with no-sew TPU overlays for durability
- Firm Ground outsole with 3mm base and 2.5mm tread depth for grip across varied hardpack terrain
- Quick-lace system with toggle adjustment for easy fit changes
- Removable Ortholite® insole with RPET components
- No traditional midsole for maximum flexibility and natural movement
- Zero-drop construction for natural posture
- Vegan-friendly recycled materials throughout
- Men’s fit
- Obsidian/Obsidian colourway
Specs
- Weight: Approx. 400g (size dependent)
- Heel-to-Toe Drop: 0mm
- Stack Height: 3mm base + 2.5mm tread depth
- Outsole: Firm Ground, 2.5mm tread
- Upper: RPET vamp knit with TPU overlays
- Closure: Quick-lace with toggle
- Best Use: Trail running, fastpacking, hiking, hardpack terrain
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 Grounding Men's Barefoot Trail Shoe – Obsidian/Obsidian
Made for trail running, the Vivobarefoot Primus Trail Knit FG Grounding Men’s in Obsidian/Obsidian is also excellent for fastpacking and hiking. Its low profile and versatility make it a popular choice wherever outdoor lovers tread. A knit upper brings flexibility and protection, the quick-lace system means easy adjustments, and the thin Firm Ground sole balances barefoot sensation with grip — feeling fast on varied hardpack terrain and building natural strength with every step.
Features
- Vamp knit upper from 81% RPET, 10% Nylon Hotmelt and 9% Elastane with no-sew TPU overlays for durability
- Firm Ground outsole with 3mm base and 2.5mm tread depth for grip across varied hardpack terrain
- Quick-lace system with toggle adjustment for easy fit changes
- Removable Ortholite® insole with RPET components
- No traditional midsole for maximum flexibility and natural movement
- Zero-drop construction for natural posture
- Vegan-friendly recycled materials throughout
- Men’s fit
- Obsidian/Obsidian colourway
Specs
- Weight: Approx. 400g (size dependent)
- Heel-to-Toe Drop: 0mm
- Stack Height: 3mm base + 2.5mm tread depth
- Outsole: Firm Ground, 2.5mm tread
- Upper: RPET vamp knit with TPU overlays
- Closure: Quick-lace with toggle
- Best Use: Trail running, fastpacking, hiking, hardpack terrain
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.