Rubber sole FLYTEFOAM Propel Technology: ASICS energetic foam formulation that provides supreme bounce thanks to a unique elastomer compound. FLYTEFOAM Propel Technology: ASICS energetic foam formulation that provides supreme bounce thanks to a unique elastomer compound. GUIDESOLE Technology: The curved sole design and stiff forefoot of our GUIDESOLE technology reduce ankle flexion and provide a shock-absorbent landing zone to lessen fatigue of other leg muscles and increase runner efficiency. Jacquard mesh upper: AHAR Outsole: Acronym for ASICS High Abrasion Rubber. Placed in critical areas of the outsole for exceptional durability.