Engineered for barefoot athletes who move between water, rock and trail, the Vivobarefoot Hydra ESC Mens Barefoot Swimrun Shoes - Obsidian/Safety Yellow deliver maximum ground feel, grip and drainage without sacrificing protection. Built for technical swimrun, fast hiking and multi-sport adventures in and out of the water.

Key Features

• Barefoot swimrun design: Ultra-minimal platform encourages natural movement, balance and proprioception while still protecting from sharp rocks and rough ground.
• High-drainage upper: Lightweight, quick-dry mesh sheds water fast so shoes feel light again within minutes after each swim section.
• ESC outsole for extreme traction: Aggressive, multi-directional lugs made to grip on wet rock, mud, roots and technical trail.
• Secure, locked-in fit: Performance lacing and supportive upper keep your foot stable on cambers and slippery terrain.
• Wide, foot-shaped toebox: Allows natural toe splay and strong, stable landings even when you’re tired late in a race.
• Vegan-friendly construction: Made without animal products, using performance materials chosen for durability and function.

Specifications

• Model: Vivobarefoot Hydra ESC Mens Barefoot Swimrun Shoes \u2013 Obsidian/Safety Yellow
• Activity: Swimrun, fast hiking, technical trail, water-based adventure
• Outsole: ESC rubber with deep, multi-directional lugs for wet and muddy conditions
• Upper: High-drainage, quick-dry mesh with strategic overlays for durability and support
• Footbed: Barefoot-friendly construction for sockless or socked use
• Drop: Zero-drop platform for natural posture and movement
• Fit: Wide, anatomical fit tailored for men’s barefoot performance
• Colour: Obsidian / Safety Yellow

Ideal For

• Swimrun races and training, where fast drainage and wet-rock grip matter.
• Technical coastal and river trails with repeated transitions between water and land.
• Fast hiking and off-trail adventures on wet, muddy and rocky terrain.
• Minimalist runners and outdoor athletes wanting maximum sensory feedback with serious traction.

Care

• Rinse in fresh water after exposure to salt water, mud or grit.
• Air dry naturally away from direct heat or harsh sunlight.
• Remove insoles (if used) to speed up drying time.
• Brush off dried dirt and debris to maintain drainage and breathability.

If you’re new to barefoot performance footwear, build up distance and intensity gradually so your feet and lower legs can adapt to the increased movement and ground feel.

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.