COMPATIBLE WITH - NUNA: PIPA Aire or PIPA Aire RX, PIPA or PIPA RX; MAXI-COSI: Mico Luxe or Luxe+, Peri 180°; CYBEX Aton M, Cloud Q, BRITAX WILLOW: S or SC STROLLER COMPATIBILITY: Compatible with all models of the Mockingbird Single or Single-to-Double Stroller TRAVEL SYSTEM: Mockingbird Car Seat Adapters make your Mockingbird Single Stroller or Single-to-Double Stroller compatible with most major infant car seats, offering an easy travel system solution that’s usable from birth. With the Car Seat Adapter, you can transport your baby from car to stroller and back again without missing a beat CAR SEAT COMPATIBILITY: Please make sure that you choose an infant car seat model compatible with the Mockingbird Car Seat Adapter. Also, select the specific adapter model that matches your infant car seat before adding it to your Babylist registry or cart EASY TO USE: Snaps on and off in seconds - line up both adapters with the stroller joints and insert until you hear a click, pull up to confirm they’re locked, then lower the infant car seat facing the handlebar until it clicks into place; the stroller folds with adapters attached for quick trips in and out of the car STROLLING WITH TWO: Using your Single-to-Double Stroller in double mode requires the 2nd Seat Kit (sold separately); Using the Single-to-Double with two infant car seats requires two sets of Car Seat Adapters plus the 2nd Seat Kit The Mockingbird Car Seat Adapter (Nuna/Maxi-Cosi/Cybex/Britax Willow set) connects your infant car seat to any Mockingbird Single or Single-to-Double Stroller. This adapter set fits NUNA: PIPA, PIPA RX, PIPA Aire, and PIPA Aire RX; MAXI-COSI: Mico Luxe, Mico Luxe+, and Peri 180; CYBEX: Aton M and Cloud Q; and BRITAX: Willow S and Willow SC. Rather than committing to a single-brand travel system, you pair the car seat that fits your family with the Mockingbird Stroller using the adapter shaped for it. Installation takes seconds: line up both adapters with the stroller joints, insert until you hear a click, and pull up to confirm they're locked. Then lower your car seat facing the handlebar until it clicks into place, just as it would on its car seat base. To remove, use the car seat's own release and lift off. The stroller folds with the adapters attached, keeping trips in and out of the car simple. Strolling with two? Using your Single-to-Double Stroller in double mode requires the 2nd Seat Kit (sold separately), and running two infant car seats at once requires two sets of Car Seat Adapters plus the 2nd Seat Kit. Confirm your exact car seat model is listed above before ordering; each adapter set fits only its specific car seat brands.