This is a mattress that comes with the STOKKE JetKids. It was included, but I kept this one in storage without using it. My child used the older model mattress a few times on the plane, and thanks to the mattress, they slept very soundly. It's a cushion mattress with side panels, so you can sleep without worrying about the armrests even in economy class seats. Also, it can be easily stored in the JetKids itself. - Brand: STOKKE - Color: Gray - Type: Mattress Pad - Size: Standard Size I have two sets of the same model, so please let me know if you need another one.