Vivobarefoot Hydra ESC is a barefoot-style, amphibious trainer engineered for swimrun and multi-terrain use. It pairs a quick-drying breathable mesh upper with a high-traction Michelin ESC outsole for secure grip and ground feel. Key attributes: Gray | Grey Black | Breathable mesh | Quick-drying upper | Breathable construction | High-traction Michelin rubber outsole | Puncture-resistant underfoot | Low-profile, flexible sole for a barefoot feel | Quick-lock toggle lacing for fast on/off | Sock-like ankle cuff for a snug, flexible fit | Pull tab for easy entry | Replaceable laces and insoles | Removable insole for drying | Waved texture across midfoot | Contrasting ankle-cuff and lacing accents | White hexagonal logo on outer midfoot | Bold brand text on heel | Two-tone gum and charcoal outsole with neon midfoot accent | Dimensions & fit: Weight (single shoe, EU 38): 310 g | Fits true to size | Composition & care: Upper vamp: 100% RPET | Upper overlay: 20% Bio Corn KPU, 80% Polyurethane | Collar knit: RPET 75%, Elastane 21%, Nylon Hotmelt 4% | Eyestay TPU: 80% Polyurethane, 20% Resin | Lining microfibre: 40% Polyester, 60% Polyurethane + Hotmelt | Laces: 100% RPET | Insole: Bloom blind insole (100% RPET); turned insole backer (100% RPET) | Outsole: Swim Run ESC Michelin Outsole (52% Synthetic Rubber, 48% Additives) | Made in Vietnam | Brush off mud and clean with a damp cloth. Remove insole and dry at room temperature; keep out of direct sunlight and avoid heat sources. Laces and insoles can be replaced.