Mattresses are usually designed to support sleepers weighing up to 250 pounds, or 200 pounds. Buying a mattress that is specially designed for heavy sleepers may be the best option if you have an above-average weight. As you gain weight, the materials used in mattresses start to matter more as the material distribution and support become more significant. The additional support is provided by spring mattresses or hybrid mattresses. If you want to try one, you might want to try one of the many types of mattresses you can buy.