Infant Snug seat is a great accessory for your Uppababy rumble seat and it makes it super comfy and cozy. It is really plush and soft and also provides great support for the babies head.
Since it was light colored, we were initially apprehensive but it retained its softness even after several washes. Since the head support is detachable, we were able to use to use the seat part even when our baby was a toddler. Bonus, it keeps the rumble seat 'clean' for longer :)