Whether you’re running the trails as a family or hiking off the beaten path, the Primus Trail Knit FG is the perfect vegan* choice for supporting their feet. The durable TPU cage brings protection and the quick-lace system easy adjustments, plus a thin Firm Ground sole balances barefoot sensation with grip, feeling fast and agile wherever your kiddo treads, every step building natural strength.
| Weight | Approx. 124g (size dependent) |
| Heel-to-Toe Drop | 0mm |
| Stack Height | 2mm base + 2.5mm tread depth |
| Midsole | No traditional midsole for maximum flexibility and natural movement |
| Outsole | Kids Outdoor Adventure outsole with 2mm base and 2.5mm multi-directional lugs for grip, traction and natural movement across varied terrain |
| Upper | High Elastic RPET yarn, hot melt yarn and spandex knitted upper with durable TPU cage protection |
| Lining | Microfiber heel counter lining |
| Insole | No insole for enhanced ground feel and natural sensory feedback |
| Closure | Quick-lace system with toggle adjustment for easy fitting |
| Materials | Vegan-friendly construction using RPET yarn, hot melt yarn, spandex knit and synthetic components |
| Best Use | Trail running, hiking, outdoor adventures, playgrounds and active exploration |
Vivobarefoot Kids Size Chart
Ensure a perfect fit for growing feet with AdventureCo’s Vivobarefoot size guide for toddlers, kids, and juniors—plus tips for natural fit and return reassurance.
How to Check Fit
Vivobarefoot intentionally fits on the larger side—allowing toes to splay naturally. You’ve likely got the right size if you can easily fit a thumb between your child’s longest toe and the front of the shoe. As feet grow and toes splay, sizes may increase over time.
You can return unused shoes within 365 days for a full refund or store credit. No stress—just the right fit!
Toddler Size Guide
| Foot Length (cm) | EU | UK | US |
|---|---|---|---|
| 12.7 | 20 | 4 | 5 |
| 13.4 | 21 | 4.5 | 5.5 |
| 14.1 | 22 | 5 | 6 |
| 14.7 | 23 | 6 | 7 |
| 15.4 | 24 | 7 | 8 |
Kids Size Guide
| Foot Length (cm) | EU | UK | US |
|---|---|---|---|
| 16 | 25 | 8 | 9 |
| 16.7 | 26 | 8.5 | 9.5 |
| 17.4 | 27 | 9 | 10 |
| 18.1 | 28 | 10 | 11 |
| 18.7 | 29 | 11 | 11.5 |
| 19.4 | 30 | 11.5 | 12 |
| 20.1 | 31 | 12 | 13 |
| 20.7 | 32 | 13 | 1 |
Junior Size Guide
| Foot Length (cm) | EU | UK | US |
|---|---|---|---|
| 21.3 | 33 | 1 | 2 |
| 22 | 34 | 2 | 3 |
| 22.8 | 35 | 3 | 4 |
| 23.5 | 36 | 3.5 | 4.5 |
| 24.2 | 37 | 4.5 | 5.5 |
| 24.9 | 38 | 5 | 6 |
Whether you’re running the trails as a family or hiking off the beaten path, the Primus Trail Knit FG is the perfect vegan* choice for supporting their feet. The durable TPU cage brings protection and the quick-lace system easy adjustments, plus a thin Firm Ground sole balances barefoot sensation with grip, feeling fast and agile wherever your kiddo treads, every step building natural strength.
| Weight | Approx. 124g (size dependent) |
| Heel-to-Toe Drop | 0mm |
| Stack Height | 2mm base + 2.5mm tread depth |
| Midsole | No traditional midsole for maximum flexibility and natural movement |
| Outsole | Kids Outdoor Adventure outsole with 2mm base and 2.5mm multi-directional lugs for grip, traction and natural movement across varied terrain |
| Upper | High Elastic RPET yarn, hot melt yarn and spandex knitted upper with durable TPU cage protection |
| Lining | Microfiber heel counter lining |
| Insole | No insole for enhanced ground feel and natural sensory feedback |
| Closure | Quick-lace system with toggle adjustment for easy fitting |
| Materials | Vegan-friendly construction using RPET yarn, hot melt yarn, spandex knit and synthetic components |
| Best Use | Trail running, hiking, outdoor adventures, playgrounds and active exploration |
Vivobarefoot Kids Size Chart
Ensure a perfect fit for growing feet with AdventureCo’s Vivobarefoot size guide for toddlers, kids, and juniors—plus tips for natural fit and return reassurance.
How to Check Fit
Vivobarefoot intentionally fits on the larger side—allowing toes to splay naturally. You’ve likely got the right size if you can easily fit a thumb between your child’s longest toe and the front of the shoe. As feet grow and toes splay, sizes may increase over time.
You can return unused shoes within 365 days for a full refund or store credit. No stress—just the right fit!
Toddler Size Guide
| Foot Length (cm) | EU | UK | US |
|---|---|---|---|
| 12.7 | 20 | 4 | 5 |
| 13.4 | 21 | 4.5 | 5.5 |
| 14.1 | 22 | 5 | 6 |
| 14.7 | 23 | 6 | 7 |
| 15.4 | 24 | 7 | 8 |
Kids Size Guide
| Foot Length (cm) | EU | UK | US |
|---|---|---|---|
| 16 | 25 | 8 | 9 |
| 16.7 | 26 | 8.5 | 9.5 |
| 17.4 | 27 | 9 | 10 |
| 18.1 | 28 | 10 | 11 |
| 18.7 | 29 | 11 | 11.5 |
| 19.4 | 30 | 11.5 | 12 |
| 20.1 | 31 | 12 | 13 |
| 20.7 | 32 | 13 | 1 |
Junior Size Guide
| Foot Length (cm) | EU | UK | US |
|---|---|---|---|
| 21.3 | 33 | 1 | 2 |
| 22 | 34 | 2 | 3 |
| 22.8 | 35 | 3 | 4 |
| 23.5 | 36 | 3.5 | 4.5 |
| 24.2 | 37 | 4.5 | 5.5 |
| 24.9 | 38 | 5 | 6 |
15,000+ 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 9+ years and over 15,000 orders delivered. Shop with confidence, the adventure is guaranteed.