Athletic Propulsion Labs Joyride running shoes put all their claims in the name, delivering an absolutely enjoyable running experience. You'll feel incredible comfort on the pavement, treadmill, and anywhere in between thanks to a midsole that maintains its structural integrity and an upper that flexes in unison with your every movement. Inspired by the shape of a feather, the outsole helps to enhance your natural motion.Upper: Chevron mesh toe box is seamless and expansive, flexing in unison with every movement. External heel counter and TPU web provide support for stability and balance. Padded tongue and heel collar enhance comfort. Flat laces reduce irritation. Midsole: Propelium™ maximizes energy generation and provides superior comfort that will maintain midsole structural integrity longer than conventional EVA formulated running midsoles.Outsole: Outsole compound developed for direct ground contact, enables the use of less rubber on the outsole, significantly reducing the weight of the shoes. Natural flex grooves react to every movement.