While looking for a bed foundation for your mattress, first check the warranty and make sure you know which types of bed foundations / box spring will void your warranty. Decide how high you want your mattress to sit. Consider that box springs can’t bend. You may need a more lightweight, flexible foundation. Look for features that suit your unique requirements. Consider head / footboard / height attachments, if you have them. And consider the body weight of everyone who will be sleeping, sitting and jumping on your bed.