Mattress Material / Construction Ratings, Hybrid Mattress Brands / Models: Ratings and Comparisons, Memory Foam Thickness and Hybrid Characteristics. This mattress will give you firm support thanks to its 100% natural latex foam. It has a plush memory foam layer that adapts to the contours of your body and a hard bottom layer that gives the mattress structure. (Just about any mattress brand offers at least one "firm" model.) No commission â¢ No endorsements â¢ Based on owner experiences â¢ Since 2008 â¢ More. Reviewers agreed that the Avocado Green Mattress was one of the best for these types of sleepers. You can make a simple hybrid mattress yourself by buying a firm non-hybrid innerspring mattress â that is, one with minimal padding.