Built for half- and full-marathon training, these shoes deliver comfort every step of the way. Features FuelCell midsole foam with approximately 3% bio-based content delivers a propulsive feel to help drive you forward. Bio-based content is made from renewable resources to help reduce our carbon footprint. Energy Arc pairs sport-specific carbon fiber plate geometry with strategic midsole voids, designed to increase stored energy to deliver a higher amount of total energy returned Angular midsole design reduces weight Outsole designed for superior traction   209.4 grams (7.4 oz) Material Soft, plush mesh upper for breathability and comfort