The mattress does not work as promised right away, but it takes time to work with it. You have to blow it really hard at first and leave it in the sunlight for a while (it gets pressurized), then after that the "cells" inside the mattress starts working. You will be in trouble with your lungs if you go directly on a cold trip with this, which is special, because this is intended for cold climates. It would be desirable if the sales information tells about it.
Verified buyerTimo P.

