The pillow makes a very robust impressed. It has the dimensions 36 x 36 cm. A "normal" butt so it fits well :-) I've just used two big breaths to inflate it. So is a quick thing. However, one must also be very fast in order to close the bag with the plugs, otherwise is the air away again. Otherwise, it smells a bit to rubber, but I think, after repeated use, are the back. The rubber material is exactly the same as the old air mattresses from GDR times (who knows this yet).