Bugaboo Butterfly 1.1 ChassisThe Bugaboo Butterfly chassis forms the core structure of your Butterfly stroller. Engineered from lightweight and durable materials, it features an integrated suspension system designed to ensure optimal comfort and safety for your child. This chassis includes the front wheels, while the rear wheels are not included and must be purchased separately. Specifications Easily fold & unfold in a second. Compact and lightweight. Large and adjustable seat.