ASICS GEL-TRAIL LAHAR 4 GTX Running Shoes Trail Specific Outsole - A reversed lugs on the sole which provides uphill and downhill traction on all types of terrain. GORE-TEX upper - A waterproof and breathable upper designed to protect the foot during extreme weather conditions. Visible Rearfoot GEL- The ASICS GEL system is based on a special kind of silicon that enables optimal shock absorption. GEL units are strategically placed in the midsole and designed to enable specific functions and positions. Trusstic System - A plastic bridge located under the arch which gives the shoe strength and stability without loss of flexibility. 3M Reflective - Improved footwear visibility when running in low level light.