Natures Sleep Cool IQ King Size 2.5 Inch Thick, 4.5 Pound Density Memory Foam Mattress Topper with 18 Inch Fitted Cotton Cover The Nature's Sleep King Mattress Topper is 2.5 inches thick and is constructed from 4.5 pound Cool IQ Visco Elastic Memory Foam Green initiative: infused with natural charcoal to reduce odor, manage moisture and help purify the air Provides a negative ion charge to help restore your body's energy balance Minimizes pressure points while sleeping on any mattress to relieve tossing and turning, and to reduce back, neck, hip and shoulder pain aches Includes an ultra-soft 300 thread count cotton cover with 18 inch skirt that will keep your pad protected and in place