100% Polyester Ergonomic Design: This Bedsure RV king size mattress pad (72x80 Inches) features an ergonomic three-zone design. The top and bottom zones feature a softer wavy design for improved relaxation. The honeycomb-shaped middle quilting provides evenly distributed support that disperses the body’s pressure. Designed to upgrade your stiff mattress to a restorative sleeping space. Optimal Comfort: Featuring Bedsure's signature thoroughly tested microfiber filling blend, this mattress pad offers extra softness and optimal support for the ideal balance of comfort and firmness.