Mattress Firm's Glossary of Common Mattress Terms It's time to buy a new bed. It can be exciting to find the perfect bed to help you sleep better and get to sleep faster, but also it can feel overwhelming researching and learning all the terminology in choosing a mattress. Coils, foam, border wires, platform beds...so many things to know! We're here to help. Our experts put together this helpful, easy reference glossary of commonly used words in the mattress world to help you along the way. Whether you need to learn about what to look for when buying a mattress or making the most of fitting a bunk bed in a small living space, this go-to guide will help you better understand the lingo before even stepping into our stores.