We do not chemically treat our materials, foams, or mattresses for any reason. The Original, Hybrid, and Legend mattresses are fully encased in a fire retardant sock made up of a proprietary blend of fibers, each chosen for its balance of comfort and flammability performance. Our proprietary fire barrier is an inherently fire-retardant fabric so it does not need or have additional chemical treatments. The barrier works by interrupting the combustion process in the event of a fire to meet the requirements of 16 CFR Part 1633. The fire sock functions to smother and dampen flames by causing a layer of char to form, thus preventing oxygen from feeding the fire and subsequently preventing the flames from reaching the foam and spreading.