ASICS GEL-TRAIL LAHAR 4 Trail Running Shoes Trail Specific Outsole - A reversed lugs on the sole which provides uphill and downhill traction on all types of terrain. 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. AHAR+ - This is a thinner and lighter version of ASICS High Abrasion Rubber. It is placed on heavy contact areas of the outsole to reduce excessive wear.