Columbia Men's Ventrailia Razor Outdry Mesh, Rubber Hiking Sneakers Mesh Lightweight Welded Textile and Mesh Upper - Provides comfort and ventilation to the feet, keeping them feeling cool and dry. OutDry - Absolute waterproof construction. Techlite - Designed to maximise impact absorption, pressure relief, support and stability. Midsole Ports - Offers air ventilation. Omni-GRIP - Ensures maximum traction, stability and the right grip in various environments.