Our old and not real comfortable memory foam mattresses (6 years old) in our RV needed replaced. We looked at several custom size mattress firms and asked on our RV forum for recommendations. Foam By Mail (foamfactory.com) was suggested along with a few others. Checking reviews and websites, we contacted several. The lady at foamfactory.com was extremely helpful and sent us samples. We selected what we thought we wanted, placed the order for 2 layer mattresses (4" foam bottom, 3" memory foam top) plus covers. The order arrived within a few weeks. They fit perfectly and after our 2 week trip, we absolutely love them! Very comfortable, very easy getting to sleep and no morning aches and pains! Superb product!