The Spine Support Bridgeport firm features a 390 coil, 13 gauge innerspring unit for solid, firm support. We then layer extra firm, resin treated fiber pads and lofted felt pads for comfort and durability. Then we quilt polyurethane foam and our Safeguard flame retardant fiber to the surface. Safeguard fiber is anti-microbial and is not chemically treated to achieve its flame retardency.