Mattress companies rarely advertise their beds as having fiberglass. For shoppers, fiberglass is a no-no due to its irritating properties. So, you’ll have to dig a bit deeper to see what your bed contains.
Check a mattress’s care instructions or label (if you already own the bed) and see if it says “do not remove cover.” This usually means there’s fiberglass under the bed’s cover. It’s important to know that some mattress covers might have zippers and say “do not remove mattress cover.”
Mattresses with third-party certifications are less likely to contain fiberglass. Look for certifications such as Global Organic Textile Standard (GOTS), Global Organic Latex Standard (GOLS), CertiPUR-US, or OEKO-TEX Standard 100.