The Primus III is for kids who already know their own minds — and feet. So keep them grounded, but set them free. The updated Primus III has the same ultra-lightweight design and flexible, grippy sole of our bestselling barefoot kids' trainer, made using recycled, animal-free materials. Now engineered with a new tongue construction for a wider opening, letting kids pull these everyday sneakers on and off by themselves. With a toggle fastening for a snug, sporty fit that keeps out the "bits", but lets all the feeling in, making sure feet grip, balance and flex as close to barefoot as possible.
Multi-terrain: Giving you grip and ground feel on everything from wet and dry, rocky and firm terrain.
Fit, Feel, Flex: For natural stability, natural sensory feedback and natural strength.
Get the Right Fit the First Time
We want to make sure you pick the perfect size when ordering online. That’s why we’ve created clear, easy-to-use size charts for every Vivobarefoot product.
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.
Our Size Guide is here to help! Vivobarefoot fit 'big' deliberately – we call this ‘the rule of thumb’. Your toes need wiggle room! This is especially important for running. If you can fit your thumb in-between the end of your toe and the front of the shoe, you’ve more than likely found your ideal size.
**After some time with Vivobarefoot shoes, your shoe size may need to increase, as your toes splay out more naturally.**
TODDLERS FOOTWEAR SIZE GUIDE
| 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 FOOTWEAR SIZE GUIDE
| 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 FOOTWEAR SIZE GUIDE
| 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 |
The Primus III is for kids who already know their own minds — and feet. So keep them grounded, but set them free. The updated Primus III has the same ultra-lightweight design and flexible, grippy sole of our bestselling barefoot kids' trainer, made using recycled, animal-free materials. Now engineered with a new tongue construction for a wider opening, letting kids pull these everyday sneakers on and off by themselves. With a toggle fastening for a snug, sporty fit that keeps out the "bits", but lets all the feeling in, making sure feet grip, balance and flex as close to barefoot as possible.
Multi-terrain: Giving you grip and ground feel on everything from wet and dry, rocky and firm terrain.
Fit, Feel, Flex: For natural stability, natural sensory feedback and natural strength.
Get the Right Fit the First Time
We want to make sure you pick the perfect size when ordering online. That’s why we’ve created clear, easy-to-use size charts for every Vivobarefoot product.
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.
Our Size Guide is here to help! Vivobarefoot fit 'big' deliberately – we call this ‘the rule of thumb’. Your toes need wiggle room! This is especially important for running. If you can fit your thumb in-between the end of your toe and the front of the shoe, you’ve more than likely found your ideal size.
**After some time with Vivobarefoot shoes, your shoe size may need to increase, as your toes splay out more naturally.**
TODDLERS FOOTWEAR SIZE GUIDE
| 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 FOOTWEAR SIZE GUIDE
| 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 FOOTWEAR SIZE GUIDE
| 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 |
10,000+ 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 10,000 orders delivered. Shop with confidence, the adventure is guaranteed.
