The perfect and easy solution to converting your single stroller to a tandem the tandem seat unit available in 7 colours has an inventive one pull harness system extendable hood and includes a rain cover it is compatible with the unique innovative and contemporary designs of the edge and city strollerswhen converting your edge stroller sold separately into a tandem where you can add the additional seat unit carrycot or car seat with adaptors all you need to do is attach your edge whe