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Compare your insole length to the guide below. To find your insole length, measure your foot and add 1.5cm for a regular fit, 1cm for a snug fit or 2cm for a looser fit. If you are between sizes we recommend going for the larger size.
To measure your foot most accurately, stand on a tape measure with your heel against a wall. While standing up and looking over your foot, read the measurement at the end of your longest toe. Remember to measure both feet and use the measurement of your longer foot. Find out more here.
"Insole cm" is our in-store measurements of the shoe's insole. "Brand cm" is the insole length the brand has given us, which is what you'll find on the box or on the brand's website. Our shoes are measured with the same method each time, so use the "Insole cm" column to get an accurate size you can compare across brands.
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Enjoy an all-year barefoot feel with the Vivobarefoot Primus Trail III All Weather FG men’s trail running shoes.
Renewed and improved, the Vivobarefoot Primus Trail III All Weather FG men’s trail running shoes are more eco-friendly and sustainable than ever. Never let the weather hold you back with the weather-resistant upper and a thin FG outsole for excellent grip on muddy terrain.
What’s new?
The Vivobarefoot Primus Trail III All Weather FG feature:
Brand : Vivobarefoot
Loc : CU-1
Gender : Mens
Product Family : Primus
Drop : 0mm
Foot Type : Neutral
Cushioning : Barefoot
Width : Standard (Wide Midfoot)
Waterproof : Yes
Vegan : Yes
Heel Stack Height : 8mm
Toe Stack Height : 8mm
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Manufacturing defects covered, replaced or repaired if soon after purchase.
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Rupert9 February 2026
Activity: Hiking
Age: 36-45
Priority: Features
Excellent for rocky trails and gravel roads Rupert, 9 February 2026 I developed Morton's neuroma and needed protection from stones (mixed grade NZ trails). Primus Trail FG sole is noticeably harder and more rigid than my other Vivo Forest ESC soles, and despite having much shallower tread they provide far better shield from sharp intrusions. The neck of the shoe is padded, with good structure, and effectively keeps the foot in place while hiking downhill. The Primus Trail FG would be great for somebody new to barefooting who needs slightly more 'shoelike' shoe. The only thing I dislike are drawstring laces, which are difficult to micro-adjust and seem to come slightly loose. Overall I am extremely impressed with these well-executed shoes, I highly recommend them especially as an introduction to barefoot shoes. Quality: Value for Money: Fit: Fit Tips: Snug, I had to size up Overall Rating:
Rupert, 9 February 2026
I developed Morton's neuroma and needed protection from stones (mixed grade NZ trails). Primus Trail FG sole is noticeably harder and more rigid than my other Vivo Forest ESC soles, and despite having much shallower tread they provide far better shield from sharp intrusions. The neck of the shoe is padded, with good structure, and effectively keeps the foot in place while hiking downhill. The Primus Trail FG would be great for somebody new to barefooting who needs slightly more 'shoelike' shoe. The only thing I dislike are drawstring laces, which are difficult to micro-adjust and seem to come slightly loose. Overall I am extremely impressed with these well-executed shoes, I highly recommend them especially as an introduction to barefoot shoes.
Fit Tips: Snug, I had to size up
Overall Rating:
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