More than one child? Easily convert your VISTA stroller to a double in-line stroller with ease and style. Designed exclusively for 2009-2014 models of the VISTA stroller, the RumbleSeat converts a single stroller to a double in-line stroller in seconds. Whether it's a quick stroll to the supermarket or a long, leisurely walk through the park, this exclusive seat provides maximum comfort and style for parents' precious cargo.