The Technology of RunningThe completely renovated Asics GEL-Flex 5 running shoe covers all the basics for the mechanics of the activity. Start with a lightweight low-cut design that features a seamless breathable mesh upper and feel the comfy padded collar the moment you lace in. Add advanced cushioning features including a SpEVA midsole with excellent bounce-back response heel and forefoot GEL systems to absorb shock and innovative construction techniques for enhanced control and support.Taking Science in StrideRevolutionary Trusstic System technology reduces weight while ensuring structural integrity and incorporating a full-length midsole Guidance Line vertical flex groove to promote a natural gait with proper pronation movement. A lot has gone into the design of this running shoe so you can get a lot out of it.•Breathable mesh upper with synthetic overlays for stability. •SpEVA foam midsole provides responsive energy return.•Heel and forefoot GEL® cushioning absorbs impacts.•Guidance Line® vertical flex groove promotes natural foot movement.•Durasponge® forefoot outsole area adds extra cushioning.