Versatile, comfortable, and suitable for any terrain. Transporting two children and switching from one configuration to another has never been easier. The seating units can be easily converted into a stroller or semi-rigid stroller attachment in just a few steps. The Chicco KeyFit infant car seat (sold separately) can also be attached to the frame. Ball bearings, shock absorbers, and rubber tires on all four wheels ensure smooth and pleasant driving, even with two children.