Wake up ready to tackle your day with this memory foam mattress topper from Simmons. This polyurethane mattress topper conforms to your body’s curves, supportive enough to ease pressure points which can lead to tired muscles in the morning. A 220-thread-count cover provides additional comfort while protecting the mattress topper from stains, and it is machine washable for easy care.Measures 5.5 inches thick. 4 inches of Gel Memory Foam plus 1.5 inch fiber filled coverDensity: 3.5 poundsFoam cradles your body, reducing pressure points that cause tossing and turning Helps rejuvenate tired muscles and eases back painCover: 220 thread count fiber cover with a stretch-to-fit 17-inch contour skirtCover care instructions: Machine washMeets all flammability standardsDimensions: Twin: 38 inches wide x 74 inches longFull: 53 inches wide x 74 inches longQueen: 59 inches wide x 79 inches longKing: 75 inches wide x 79 inches longCal King: 71 inches wide x 83 inches longMemory Foam Tips: Remove from packaging within 72 hours of receipt to maximize memory foam expansion.This product arrives very tightly packed. Unwrap and allow 48 hours for this product to return to its original shape.Being sealed in plastic packaging sometimes traps odors. After unwrapping, allow product to air for a few hours.Due to machine-cutting manufacturing processes, there may be slight variances in the dimensions of this product.Due to the nature of Memory Foam the firmness level of every item is unique. Please be advised that even similar products may produce different firmness results.Once opened this product is not returnable to view mattress topper buying guide.