ASICS Men's GEL Sendai 3 Running Shoe 100% Synthetic Imported Rubber sole Fluid fit asics fluid fit upper technology combines multi-directional stretch mesh with stretch reinforcements that adapt to the athlete's foot, creating a truly customized glove-like fit Heel clutching system exoskeletal heel counter provides improved support and creates improved heel fitting environment Discrete eyelets independently placed eyelets disburse lace tension, creating a customized fitting environment and enhanced upper comfort Discrete heel unit takes the impact guidance system (i.g.s) to a new level by creating our highest degree of shock attenuation and stability Discrete Heel Unit Takes the Impact Guidance System (I.G.S) to a new level by creating our highest degree of shock attenuation and stability