The BOB Revolution flex stroller with the latest innovative features, the Revolution FLEX is perfect for any sport experience. Also available in a single one-seat model. The Revolution flex stroller has a height adjustable padded handlebar, with 9 positions, creates a perfect fit for any parent. A swiveling front wheel allows for superior maneuverability. Locks forward for increased stability jogging or when the terrain turns tough. Easy, two-step folding, lightweight frame for convenient transport and storage. State-of-the-art, adjustable suspension system provides an exceptionally smooth ride. The Revolution flex stroller allows you to walk with baby right away when using the BOB Infant Car Seat Adapter and compatible infant car seat. BOB recommends babies be at least 8 weeks old before riding in the stroller without an Infant Car Seat Adapter and compatible car seat. BOB recommends babies be at least 8 months old before running, jogging or off road use.