Doona Infant Car Seat Stroller, which is designed for newborns and infants up to 35 lbs or 32 inches in height. It functions as both a car seat and a stroller, allowing for easy transitions between car rides and walking. The Doona features integrated wheels that fold out for stroller use and retract for car seat installation. It also includes safety features such as a five-point harness and side-impact protection. The stroller mode is designed for smooth surfaces, while the car seat mode meets safety standards for vehicle travel. It is often favored for its convenience and space-saving design, especially for urban living and travel.