ASICS GEL-LAHAR 3 GORE-TEX Trail Running Shoes 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. GORE-TEX Upper - This is a waterproof and breathable membrane. Trusstic - A molded component under the mid-foot area. Provides stability and in combination with the contoured midsole helps to control torsional stability.