From Cybex, this S seat features: As your family grows, convert your eGazelle or Gazelle S from a single to a double stroller with a second full size seat to allow two children to ride at the same time. Each eGazelle/Gazelle S seat can be used in parent-facing or forward-facing mode and can be attached on either the stroller’s upper or lower positions. Easily converts your eGazelle or Gazelle S from a single to double stroller without additional adapters Full-sized seat supports a child up to 50 lbs. One-Pull Harness: Our user-friendly harness system makes securing your child in the seat a breeze with one simple pull – no fuss and extra handy if you’re doing it twice Independent back and leg adjustments offer multiple configurations, allowing you to position your child for comfort Extendable XXL sun canopy with mesh window and a UPF 50+ rating Large seat unit reclines to a near-flat position Removable bumper bar makes it easy to get child in and out of the seat Includes: 1 Seat Unit (Stroller sold separately) Measurements: 13.5" L x 16" W x 31" H, Weight: 9 lbs. Use from 6 months up to 50 lbs. Compatible with CYBEX Gazelle S 2 and eGazelle S Strollers Imported.