The Hydro Moc all-terrain system is an evolution of the controversial Hydro Moc, which emerges from the water and adapts to varied environments. All models use the same design system, defined by an EVA foam caged upper, which is super-resilient and water-friendly. The Ripstop system is designed with an 80% recycled nylon upper, a BLOOM® performance foam midsole made from 10% algae biomass, and an external back strap that locks the heel, with a zipper. knee lace that allows the wearer to easily put it on and take it off easily.