The Vivobarefoot Hydra ESC Womens Barefoot Swimrun Shoes – Obsidian/Safety Yellow are built for amphibious athletes who want maximum ground feel, natural movement, and reliable grip in and out of the water. Designed specifically for women’s feet, they combine a fast-draining, quick-drying upper with a rugged, high-traction outsole so you can transition seamlessly between swimming and technical trail running.

Key Features

• Women’s-specific barefoot design: Thin, flexible sole encourages natural foot splay and proprioception while still protecting you from sharp rocks and roots on the trail.
• Amphibious construction: Lightweight materials drain and dry rapidly, staying comfortable and light even when soaked – ideal for swimrun, coasteering, and wet-weather trail runs.
• Quick-lock lacing: Hydrodynamic, quick-lock lacing system allows easy, secure adjustments on the move and reduces drag in the water.
• RISE foam insole: Insole made using excess algae biomass that helps clean up waterways, offering a cushioned glide through the water without sacrificing ground feel.
• Michelin® ESC outsole: Aggressive, multi-directional lugs provide serious traction on slick, muddy, and rocky terrain, giving you confidence on technical off-road routes.
• Flexible and responsive: Highly flexible construction lets your feet move naturally for better stability, balance, and feedback from the ground.
• Vegan-friendly materials*: Built with performance textiles and synthetics designed for durability in wet conditions. (*Check size/colour for final material details.)

Specifications

• Model: Vivobarefoot Hydra ESC Womens Barefoot Swimrun Shoes – Obsidian/Safety Yellow
• Style: Minimalist / barefoot amphibious swimrun shoe
• Fit: Anatomical, foot-shaped fit optimised for women’s feet to allow natural toe splay
• Gender: Womens
• Upper: Fast-draining, quick-drying mesh and synthetic materials
• Outsole: Michelin® ESC rubber with aggressive lugs for wet and dry, rocky and firm terrain
• Flexibility: Highly flexible for a natural stride and enhanced ground feel
• Drop: Zero-drop platform for natural posture and alignment
• Colour: Obsidian/Safety Yellow

Ideal Use

The Vivobarefoot Hydra ESC Womens Barefoot Swimrun Shoes – Obsidian/Safety Yellow are a great choice if you:

• Want barefoot swimrun shoes that let your feet move naturally in and out of the water.
• Regularly train or race on mixed, technical terrain including wet rock, mud, coastal tracks, and forest trails.
• Need footwear that drains and dries quickly while still providing dependable grip and protection.
• Prefer a minimalist, zero-drop feel that encourages natural movement and stronger feet.
• Are transitioning from traditional cushioned trail shoes to barefoot and minimalist footwear and want a performance-focused option for wet conditions.

Care

• Rinse with fresh water after exposure to saltwater, sand, or muddy conditions.
• Brush off debris from the outsole and upper, especially around drainage areas and lacing.
• Hand wash with mild soap and lukewarm water; avoid harsh detergents or bleach.
• Air dry away from direct heat sources and intense sunlight.
• Store in a cool, dry place between sessions to help maintain materials and shape.

If you are new to barefoot swimrun or trail shoes, build up your distances gradually to allow your feet and lower legs time to adapt.

Vivobarefoot Women’s Size Chart

Ensure the perfect fit with your Vivobarefoot shoes. Our guide provides accurate size conversions (cm, EU, UK, US), the “rule of thumb” toe-room tip, and flexible 365-day returns.

Women’s Footwear Size Guide

The "Rule of Thumb" Fit Tip

Vivobarefoot intentionally fits larger to give your toes room to wiggle—especially important for natural movement. If you can comfortably fit your thumb between your longest toe and the shoe’s front, you’ve likely found the right size. Over time, as your toes naturally splay, you may need to go up a size.

How to Measure Your Feet

• Stand with your heel against a wall on a hard surface and measure from wall to tip of your longest toe in centimeters.
• Use the “cm” column above to determine your size.
• Measure both feet and base your choice on the larger measurement.
• Measure at the end of the day when your feet are slightly larger.

Sizing Advice & Return Policy

• Vivobarefoot fits liberally—don’t size down to compensate. A bit more room means better barefoot feel.
• If you're between sizes or plan to wear thick socks, consider sizing up for lasting comfort.
• Not completely sure? You have a full 365 days to return unused shoes for a refund or store credit—stress-free returns.