Evolution is watching a baby develop. Revolution is watching the buggy develop from newborn to upright toddler(s). The revolutionary e3 accomodates infants to toddlers with its versatile design, and transforms from a single to a double buggy with a simple addition. This is the perfect stroller to grow with each child, as the family grows. Related Terms used to find this item - Phil and Teds e3 Stroller, Singles Single Strollers