Product guide
Details, specs & what to know
Manufacturer-confirmed details, Confluence fitting context, model history and the information we'd want before choosing this shoe.
Vivobarefoot · Men's · Barefoot trail footwear
Primus Trail FG 3.5
A lightweight, flexible trail shoe designed to preserve natural movement while adding firm-ground traction for mixed outdoor terrain.
Firm-Ground Traction
The trail outsole is built for grip across dirt, packed paths, forest trails, and varied firm terrain.
Natural Flexibility
Thin, flexible construction lets the foot bend and respond to the ground while maintaining a barefoot-inspired feel.
Trail-Ready Upper
A lightweight, breathable upper keeps the shoe agile for trail running, hiking, and outdoor exploration.
Choose your color
Use the color selector to compare available Primus Trail FG 3.5 colorways and the size selector for live inventory. Each color keeps its matching product imagery on this consolidated page.
Fit & sizing
Use the live size selector for current availability. If you're comparing trail shoes or transitioning to barefoot footwear, Confluence Running can help with fit and use-case guidance.
Compare additional barefoot footwear for training, walking, trail use, and everyday movement.
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Confluence Running serves runners and walkers across Binghamton / Johnson City, Corning, the Hudson Valley, Watertown / North Country and Lake Placid. Bring your current shoes, your training questions and what has or hasn't worked—we'll help you compare options in motion.
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