Sold in 1 or 3 packs, Adjustable to four popular seat heights to allow children's feet to rest on the ground for maximum comfort: 7", 9", 11", and 13", Quick-remove tray is easy to use by engaging the triggers under the tray, Stack up to 4 high without tray for space saving storage, 3-point adjustable harness and no-slip passive restraint keep child safely seated