-Think about your shoes now, and forget about them on race day. New Balance’s London Marathon edition of the FuelCell Supercomp Elite v3 is designed with a dual focus on energy return and lighter weight, with the dynamic energy return of the Energy Arc system complemented by a breathable, engineered knit upper featuring a built-in tongue, for a secure, locked-in fit. It’s not just a running shoe. It’s a racing shoe.-FuelCell foam delivers a propulsive feel to help drive you forward-Energy Arc pairs advanced carbon fiber plate geometry with strategically shaped and placed midsole voids, designed to increase stored energy to deliver a high amount of total energy returned-Engineered knit upper with built-in tongue-London Marathon edition New Balance New Balance Womens London Edition FuelCell SuperComp Elite v3 (Standard) - Blue Haze