Mattresses are available in different sizes. It is dependent on the factor of the size of bed frames. For mattresses; sizing does matter. You should decide what sized mattress you want to purchase. Mattress sizing include single, twin, full, queen, king, and grow bigger respectively. If you sleep alone, or are buying a mattress for an adolescent or youngster, a single or twin sized mattress should accommodate your needs. The queen and king size mattresses are ideal for couples and allow a whole slew of space for sleeping in comfort. You want to make certain that your chosen mattress fits any bed frame you'll be using and existing box spring. Otherwise, you should buy a box spring with your new mattress.