The duet gives side-by-side new meaning with its ease of maneuverability and slim, single buggy width. While it"s lighter and more compact, the duet still packs a punch with robust engineering and ultra adaptability. Versatile, convenient, and compact, the Mountain Buggy duet Double Buggy Stroller can be used in either single or double mode to suit the changing needs of your family. This side-by-side stroller accommodates one child or two, from birth up to 5 years. The duet"s slender, compact design and 10-inch tires make it easy to maneuver on urban streets or mountain trails, so you can enjoy the fun and freedom of an active lifestyle with kids in tow. New features for 2013 include: Tail free harness for no-fuss strap adjustment without excess straps ensuring no risk of harming baby, swing-away bumper bar, automatic frame lock, and easy to remove zip-off fabric. Now compatible with the Peg Perego Primo Viaggio car seat (with adapter sold separately)