This is an inner cushion I purchased last year from Lehman. I used it with the Restilo ISOFIX. Since the original is no longer in production, this is a replacement, but it worked without any problems. It has rubber bands on the back to hook onto the back of the main unit. I used it from the newborn stage to a few months old, and it's well-made and hasn't lost its shape, so I'd like to pass it on to someone who needs it. Please refrain from purchasing if you are concerned about minor details, as this is a used item.