Feel the joy of swimrun adventure. The Hydra ESC brings pinnacle swimrun performance through pioneering design. Hydrodynamic lacing and a Bloom® foam insole help you glide through water. All materials drain and dry quickly and stay light when wet. And the Michelin© ESC sole grips the slickest, most technical trails.

Like nothing on the swimrun market

• The quick lacing system features a lace pocket for hydrodynamic performance.
• The closed-cell Bloom® foam insole, made with EVA and 10% Algae Bloom® (which harms our oceans if not removed), absorbs minimal water to reduce wet weight and increase your water speed.
• The materials drain and dry quickly, and stay lightweight even when dripping wet.

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.