Yes! Virtually all mattress warranties specify that coverage will be canceled if your product is damaged. The word “damage” doesn’t just include things like big tears or broken springs. Many manufacturers also won’t honor their warranties for stained mattresses or mattresses that have bad odors.
Mattress protectors can defend your mattress against pests, odors, and stains. This will preserve your mattress in the event you need to call in the warranty. Just be sure you’re getting a waterproof protector. A protector that can’t keep out liquid stains is no protector at all.