Sleep Innovations Dual Layer 4-inch topper, King Luxurious 4-inch dual-layer topper forms to body curves for pressure point relief and improved circulation Exclusive 2-layer design features a plush 2-inch down alternative comfort layer and a 2-inch bottom layer of SureTemp Memory Foam Removable, machine-washable 300-thread count 100-percent cotton fitted cover holds topper securely in place on mattress After unpacking, allow up to 72 hours for topper to fully expand Includes 10-year limited manufactures warranty