Vivobarefoot Ultra Pure Eva Women's Water Sports Shoe 100% Synthetic Imported Synthetic sole Upper: EVA: 3D upper-outsole with perforated, non-toxic, two density, soft, high abrasion resistant EVA (Ethylene Vinyl Acetate) Lacing: Elastic Lacing: Elastic cord and lock lacing system allow for a quick, secure and personalized fit Sole Construction: Amphibious: A fully molded, soft, high abrasion injected EVA sole with high levels of durability, grip and traction Outsole Thickness: 7mm: Starting at 7mm, the amphibious outsole compresses to 3mm with continued use offering maximum proprioception with protection Eco Credentials: 100% Vegan; Dual density injection molded for glueless, mono-material shell