Engineered textile mesh upper Ultra light weight molded EVA midsole Cushioned sock liner for step in comfort Padded collar for comfort and a snug fit The Helio Trainer is a simple running inspired trainer that features an ultra-light molded EVA midsole and a breathable engineered mesh upper that provides lightweight cooling comfort and fit. Whether walking or going for a light jog, this comfort engineered trainer will keep you on your feet all day, mile after mile.