The Vivobarefoot Primus Lite IV Men’s Midnight is a minimalist training shoe built to help your feet move, feel and strengthen naturally. Lightweight, flexible and foot-shaped, it’s designed for everything from gym sessions and road runs to all-day urban wear.

Key Features

• Barefoot design: Wide, thin and flexible construction to promote natural movement and balance.
• Primus outsole: Low-profile, grippy sole keeps you close to the ground for maximum ground feel.
• Recycled materials: Upper and components made with recycled synthetic materials to reduce waste.
• Breathable mesh: Lightweight, ventilated upper keeps feet cool during high-intensity training.
• Ortholite Performance insole: Insole made from 98% recycled polyurethane foam for comfort with a lower environmental impact.
• Vegan-friendly construction*: Built without primary animal-based materials (*adhesives and dyes not fully verified).

Specifications

• Use: Barefoot training, gym, road running, everyday wear.
• Upper: Breathable, recycled synthetic mesh.
• Outsole: Primus performance outsole for grip and flexibility.
• Insole: Removable Ortholite Performance insole (98% recycled PU foam).
• Fit: Wide toe box for natural toe splay.
• Drop: Zero-drop barefoot profile.

Ideal Use

The Primus Lite IV is ideal for runners and athletes transitioning to or already training in barefoot footwear. Use it for gym workouts, functional fitness, short to mid-distance road runs and everyday urban movement when you want maximum ground feel and natural foot function.

Care

• Remove insole and surface dirt after use with a soft brush or damp cloth.
• Air dry away from direct heat sources and sunlight.
• Do not machine wash or tumble dry.
• Store in a cool, dry place to maintain materials and shape.

Vivobarefoot Men’s Size Chart

Ensure your Vivobarefoot shoes fit just right. Our guide includes accurate size conversions (cm, EU, UK, US), the “rule of thumb” for toe-splay, and easy 365-day returns.

Men’s Footwear Size Guide

The Rule of Thumb

Vivobarefoot deliberately fits larger—your toes need room to splay naturally. If you can fit your thumb between your longest toe and the shoe’s front, you're likely wearing the right size. Over time, as toes spread, you may need to move up a size.

How to Measure Your Feet

• Stand on a hard surface with your heel against a wall.
• Mark the tip of your longest toe and measure to the wall in cm.
• Use the measurement above to choose the corresponding EU/UK/US size.
• Measure both feet and use the longer measurement.

Sizing Tips & Returns

• Vivobarefoot shoes run larger than traditional footwear—don’t worry, this supports natural toe splay.
• If you’re between sizes, we recommend sizing up for comfort rather than over-tight fit.
• Changed your mind? Return unused shoes within 365 days for a full refund or store credit—no questions asked.