What is the term used for the protective layer on mattresses?

The protective layer on mattresses is referred to as "ticking." Ticking is a durable fabric that encases the internal materials of the mattress, such as foam, springs, or batting. Its primary function is to protect these components from dust, dirt, and physical wear, contributing to the mattress's overall longevity. Additionally, ticking often adds an aesthetic element to the mattress, as it can come in various colors and patterns.

While the other terms may refer to related concepts, they do not adequately capture the specific role of ticking. "Covering" is too generic and can refer to any layer that covers something, not specifically designed for mattress protection. "Fabric shield" suggests a protective aspect but lacks the specific historical and industry-recognized usage that "ticking" possesses. "Protector" is also a broader term that could imply an additional layer, like a mattress protector, which is typically removable and serves a different function than the ticking itself.