Natural toe freedom
Your feet were made to spread and grip. A foot-shaped toe box lets every step feel open, steady, and natural.
Primus Trail Flow Men's
$190.00
COLOR:Storm Cloud
Free U.S. shipping on orders over $60.
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Description
The Primus Trail Flow is a lightweight, high-performance barefoot trail runner designed to deliver exceptional ground feel and natural movement across varied terrain. Its ultra-thin sole (around 1.8mm base with ~3.5mm tread) provides responsive feedback while maintaining reliable grip for off-road adventures. Built with a breathable 100% recycled mesh upper, it keeps your feet cool and secure with a snug, performance-focused fit. The shoe eliminates the insole entirely, allowing for a more direct connection to the ground and a truly minimal experience. Designed for agility and speed, it prioritizes flexibility and traction over heavy cushioning, making it ideal for experienced barefoot runners. With its streamlined construction and eco-conscious materials, it balances sustainability with performance for fast, natural trail movement.
Specs and Fit
Weight219g (7.7 oz) (size EU 42 | UK 8 | US 9)
Stack Height5.3mm (0.21 in)
Drop0mm (0.00 in)
WidthAnatomical
FlexibilityFlexible
SizingTrue To Size
Sizing TipOfficial sizing guidance says this Vivo fits true to size.
Width NotesFoot-shaped fit designed to let the toes splay for balance and a stable base of support.
Flexibility NotesOfficial copy describes a super lightweight and flexible E-TPU midsole paired with responsive ground feel for trail running.
MaterialsRecycled Polyester, Mesh, TPU, Polyurethane, E TPU Foam, Synthetic Rubber, Nitrile Rubber, Natural Rubber
Removable InsoleNo
Insole DetailsOfficial product features list 'No insole' to keep the foot closer to the ground.
VeganYes
Vegan DetailsOfficially marked Vegan*: the main materials are synthetic and not derived from animals, but Vivobarefoot says it cannot yet guarantee every small component fully meets vegan best practices.
FeaturesTrail Flow All Terrain outsole, breathable mesh upper, 1.8mm base with 3.5mm lugs, and a lightweight trail-focused build for fast hiking and trail running.
30 Days
Return within 30 days in the original packaging for a full refund. Keep items clean and unworn. Worn, dirty, or missing packaging cannot be accepted. More info
3 Reasons
Why you should wear barefoot shoes
Better body alignment
When heel and forefoot sit level, the whole body stacks better. You stand taller, move smoother, and feel more balanced.
Feel the ground
A thin, flexible sole brings back ground feel. That feedback builds confidence, stability, and control.
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