The BOB Revolution flex duallie stroller with the latest innovative features, the Revolution flex is ideal for any sport experience. In addition accessible in a single one-seat model. The Revolution flex duallie baby stroller offers a height flexible padded handlebar, with nine positions, creates a perfect fit for any kind of parent. A rotating front wheel enables for superior maneuverability. Locks ahead for elevated stability jogging or whenever the landscape turns tough. Easy, two-step folding, light-weight body for convenient transportation and storage. State-of-the-art, flexible suspension system offers an exceptionally smooth ride. The Revolution flex duallie baby stroller allows you to stroll with infant right away when using the BOB Baby Baby Car Seat Adapter and compatible infant car seat. BOB recommends babies be from least 8 days old before driving in the baby stroller without an Baby Car seat Adapter and compatible car seat. BOB suggests infants be at minimum 8 months old before running, running or off road use.