Vivo Barefoot Ultra Eva Running Shoes has EVA technology that uses the 3D upper-outsole for a perforated, two density, & high abrasion resistant Ethylene Vinyl Acetate. The Elastic Lacing Elastic cord & lock lacing system allow for a quick, secure & personalized fit. The Panel & Lining is use a plug-in stretchy mesh tongue for climate control & preferred fit while the removable Sock Liner Plug-in uses puncture-resistant material for increase climate control & added protection. The amphibious EVA is a fully molded, soft, high abrasion injected EVA sole with high levels of durability, grip & traction.