Topo Athletic Hydroventure Running Shoe - Men's Synthetic Thanks to the single-layer laminate eVent upper, the Hydroventure promises breathability and durability in the lightest fully waterproof trail running shoe on the market today. The EVA midsole features a flexible rock plate to protect against rocks and roots while delivering a smooth responsive ride. eVent Waterproof Synthetic/mesh Upper Fully gussetted tongue to keep out dirt and debris EVA midsole features a flexible rock plate to protect against rocks and roots while delivering a smooth responsive ride. Carbon rubber outsole features multi-directional lug traction, forefoot flex grooves, and mud release features, optimizing rubber surface area for durability and grip. Usage Recommendation: Trail Running<br>