Vivobarefoot Women's Ultra Pure L-W, Crimson, 39 EU/8.5 M US 100% Synthetic Synthetic sole Amphibious: A fully molded, soft, high abrasion injected EVA sole with high levels of durability, grip and traction. 7mm: Starting at 7mm, the amphibious outsole compresses to 3mm with continued use offering maximum proprioception with protection. Removable: Plug-in stretchy mesh tongue for climate control and preferred fit. EVA: 3D upper-outsole with perforated, non-toxic, two density, soft, high abrasion resistant EVA (Ethylene Vinyl Acetate) Elastic Lacing: Elastic cord and lock lacing system allow for a quick, secure and personalized fit. 100% Vegan: Dual density injection molded for glueless, mono-material shell. Country of Origin:&#160;China