Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Will Work for Certain Car Seats

DO NOT purchase this item if your child has a Britax Boulevard car seat (Britax Boulevard Click and Safe Convertible Car Seat - Cowmooflage). The SIP headrest doesn't provide enough room for the neck support pillow. I put it on my daughter and she couldn't even move her head! Needless to say it won't work for that particular car seat! I am sure that it would work wonderfully with the Britax Marathon (Britax Marathon Convertible Car Seat Granite) which is the car seat we have in another car.