The Nuna ® flex stroller that's seen you through the newborn stage can keep delivering smooth rides for years, thanks to this add-on seat. Designed for babies 6 months and up who are transitioning out of the original PIPA™ urbn car seat, this seat clicks right into the lightweight, all-wheel suspension stroller frame. Turned toward you or out toward the world, the seat has all kinds of comfort-boosting details, including an all-weather seat that's cozy in winter and converts to mesh in the summer, an extra-large canopy and 3 recline positions.