The materials used in name brand mattresses can vary, depending on the country in which they are made.
I can tell you that hotels are now getting better quality mattresses from the name brands in the US, than the quality they are making for retail stores.
There is little to no memory foam used in many of the hotel mattresses, while the retail floors are a sea of mattresses loaded with memory foam.
Memory foam is thee worst upholstery material ever invented...contrary to the hype from the ads and the sales pitches.
People living in the US, can buy directly from the hotel.
What you'll look for is a mattress using an individually pocketed coil system.
The best upholstery material has always been latex, but polyurethane foam isn't bad.
Avoid buying any mattress upholstered with memory foam, and you'll have made a successful purchase.