I bought another one of the same series in a larger size for 50€ from a well-known toy store. This one was purchased for 65€. The first one didn't need any additional air for 2 weeks at the camping, which means it didn't lose any air at all. The second one needed to be refilled every day. I think it's a risk every time you buy a mattress, hoping that you get a good one! The store I will choose for my next purchase will also be the cheapest.