Nora 12" Medium Memory Foam Mattress If you're looking for something that isn't too firm or too soft, then the Nora 12" Medium Memory Foam Mattress ($280-$550) is a great option. Made with medium-level memory foam, customers say it's just the right amount of comfort. Image Source: wayfair.com Nora 12" Medium Memory Foam Mattress $280 from wayfair.com Buy Now