The Silver Cross Wave Stroller Onyx is designed for growing families, offering a seamless transition from a single to a double stroller with 7 configurations. It features a super-strong magnesium alloy frame, a reversible seat with adjustable positions, and a bassinet for newborns. The stroller is built with eco-friendly materials, including fabrics made from recycled plastic bottles, and offers comfort and safety with a Genius harness system, large puncture-proof tires, and four-way suspension.