NO! Our mattresses do not contain fiberglass. All mattresses sold in the United States are required to pass a Federal Flammability Standard and many of them use a fire barrier which contains fiberglass in order to pass that standard. Our fire barrier is a knit blend of polyester and cotton, which has been treated with a food grade salt. This specially crafted barrier enhances the mattress with exceptional softness, breathability, and stretchability, contributing to its elite comfort and superior temperature regulating features. Rest assured, our mattress prioritizes your safety without compromising on luxurious comfort.