I would give the mattresses and customer service zero stars.
Bought a 10 inch it inflated to just under 9 and is horribly uncomfortable. Company doesn't answer the phone. You will end up emailing customer service and then they will offer you a 20% refund or return in compressed condition via fedex. Then will let you know that return shipping is your responsibility. They only honor of you are within 30 days which I did reach out but they were slow to respond. Bottom line but somewhere else unless you want no warranty.