Should I worry about fiberglass in memory foam mattresses?

It's a real and recurring complaint in community threads. Several r/Mattress posts about the Classic Brands Cool Gel and other budget foam beds describe fiberglass fire-barrier issues if the cover is removed. Many newer models, including several Nectar, Novilla and FATHOM listings, now advertise fiberglass-free covers; if this concerns you, never unzip the cover and look for explicit fiberglass-free certification.