Mockingbird 2nd Add-On Seat Kit 3.0 - Black

The Mockingbird 2nd Seat Kit allows you to convert your Single-to-Double Stroller to double mode. It comes with a 2nd stroller seat, as well as a set of adapters to make room for two riders.
Unlike many convertible strollers’ add-on seats, the seat in Mockingbird’s 2nd Seat Kit is identical to the seat included with the Single-to-Double Stroller. This means you can stroll in double mode with two kids up to 45 lbs, and you can choose to have your younger child closer to you.
It also means that the 2nd seat has all the features of the Stroller seat, including Mockingbird’s FullShade™ system, which pairs their XL canopy with the new built-in LegShade™ for head-to-toe UPF 50+ sun coverage. Other parent-favorite features include the magnetic buckle, height-adjustable canopy, reversible seasonal seat-liner, reflective piping for safer nighttime strolls, and in-seat storage.
You can see all possible configurations at hellomockingbird.com/setups.
If you’re planning to stroll with one of your kids using the Bassinet or Car Seat Adapter, you’ll still need the 2nd Seat Kit adapters to convert to double mode, and then you can start using the 2nd stroller seat when your child develops head and neck control (typically around 4-6 months).
To stroll with twin infants, you’ll need the 2nd Seat Kit plus two Car Seat Adapters or two Infant Seat Inserts. The Single-to-Double Stroller is not compatible with two Bassinets.