FuelCell foam delivers a propulsive feel to help drive you forward NDure upper technology designed for superior durability Fit Weave Lite keeps its shape for targeted stretch and support with an extra lightweight feel Energy Arc pairs advanced carbon fiber plate geometry with strategically shaped and placed midsole voids, increasing stored energy to deliver a high amount of total energy returned Full-length Ndurance outsole provides superior traction and durability to help get more wear out of the shoe