The Silver Cross Wave Stroller includes one car seat adapter, but this adapter allows you to add another car seat, allowing the Wave frame to carry two car seats in tandem. This particular setup is great for accommodating infant twins when you’re in and out of the car, running errands, or traveling. Compatible with Maxi-Cosi Mico AP, Mico 30, Mico Max 30, Cybex Aton, Aton 2, Aton Q, and Nuna Pipa.