The FuelCell foam within this product offers a propulsive sensation that aids in propelling you forward. The upper portion is made of synthetic engineered mesh, allowing for breathability and a light overall feel. The tongue has a sleek design, and the collar is thinner to maximize heel lockdown. The Energy Arc incorporates advanced carbon fiber plate geometry, along with strategically shaped and positioned midsole voids, which work together to enhance stored energy and ultimately deliver a substantial amount of total energy returned. Additionally, the product features a carbon fiber plate.