For infants too small to sit inside a stroller seat, or for simple convenience in transferring from car to stroller, the Baby Jogger Car Seat Adaptor is a necessary accessory. It is designed to fit several popular car seats including, Peg Perego Primo Viaggio, Britax Companion, and most Graco and Evenflo models. Compatible with the Performance Series Single strollers, the adaptor works with car seats that hold infants up to 20 lbs. and less than 26in. tall.