Vivobarefoot - Ultra IV - Lunar Rock - Men's 2025 London 2 side waistband fit keys

2 side waistband fit keys or nutrition

These all-terrain trainers are light and flexible enough to move freely

Trail-friendly tread is ready to take you up and down nearly every trail

Be Seen at Night

GurneyGoo helped them win in the worst extremes

Vivobarefoot - Ultra IV - Lunar Rock - Men's 2025 London 2 side waistband fit keysThe Ultra IV is your go to amphibious footwear for exploring where land meets waterlightweight, flexible, and built for barefoot movement in nature. The Ultra IV is for barefoot adventure seekers who want to get fully immersed in nature. With an open honeycomb design it's created using 55% Braskem's Sugarlite, every bit as lightweight and comfortable as traditional EVA but made with sugarcane for a lighter impact, flexibility and full barefoot