Set a price point for the mattress. There are several factors, including quality, size and manufacturer, that determine the mattress's price. Keep in mind how often the mattress will be used when setting the price point. This mattress will be used seven to nine hours a day, seven days a week. Spend more on your own mattress than you would spend on a mattress for the guest room, which won't be slept on as often.
Choose a size based on your room's size and your personal situation. For instance, a twin mattress is sufficient for a child or teenager, while two adults might prefer the luxury of a California king. A full or queen mattress is also a better choice for a teenager or adults with a smaller master bedroom. An extra-long twin mattress works for a growing teenager who has a bedroom that won't accommodate a full or queen mattress.
Select a mattress based on your personal comfort level. Some people prefer a firmer mattress, while others enjoy falling into a soft, pillow-top model. Generally, firmer mattresses are less expensive than softer models, but provide more support for people suffering from back and neck issues. If you have a partner, consider a two-zone adjustable mattress that allows you both to choose your comfort level.
Choose a type of mattress. Modern mattresses come in four varieties: air, spring or coil, latex and foam. Air mattresses are supported by a plastic bladder that can be adjusted depending on your comfort level. Foam and latex mattresses tend to be more expensive than a traditional coil or spring mattress, but also come with a longer warranty.
Test the mattress before you buy. Lie on the mattress in your typical sleep position and test its comfort level and durability. If applicable, bring along your partner for the test to ensure his comfort level is also met.