The combination of XPOP PU and Mizuno Foam Wave adds a whole new quality to the cushioning in the Mizuno Wave Skyrise 2. Lightness and flexibility, comfort and feeling like you're floating. The breathable material of the AIRmesh upper part fits perfectly on the foot and guarantees comfort. XPOP is a blend made of Polyurethane foam, which provides extremely soft cushioning, high energy return and durability. SmoothRide technology for a smooth running feel and a smooth transition from impact to rebound.