Mattress covers are crafted from a soft, quilted cotton material. Features a support systems with individually wrapped, heat-tempered coils to minimize motion transfer. Center coils combined with quantum-edge coils provide edge-to-edge sink-into support for extra comfort and less back and joint pain. Firm mattresses feature 4 of 1.8 density foam and have a 35 ILD rating. Pairs perfectly with our Premium 8 Box Spring or Premium 2 or 4 Platforms. King features 1136 coils. Queen features 932 coils. Full features 778 coils. Twin features 590 coils. Rotating and flipping mattress periodically is recommended. Mattress protectors are recommended. Applicable mattress recycling fees (as mandated by certain U.S. states) will be charged to customers in California, Oregon, Rhode Island, and Connecticut.