DESIGN: Synthetic upper material Bootie upper construction hugs your foot for a snug, supportive fit One-piece integrated tongue construction for a secure, breathable, no fuss fit Lace closure for an adjustable, secure fit Flying New Balance® branding IN-SHOE COMFORT: 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