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* Ultra Soft memory foam 4-inch mattress topper will give any mattress a luxurious pillow top feel * Bedding recognizes your individual shape and pressure points and adjusts accordingly * Mattress topper is made of high-density 4-pound open cell breathable memory foam * Measures 4 inches thick * Temperature neutral memory foam so room temperature will not make it change firmness * Hypoallergenic, anti-microbial, temperature-sensitive foam promotes a healthy night's sleep * Promotes better circulation and less tossing and turning Dimensions: * Twin: 37 inches wide x 72 inches long x 4 inches thick * Twin XL: 37 inches wide x 77 inches long x 4 inches thick * Full: 51 inches wide x 72 inches long x 4 inches thick * Queen: 58 inches wide x 77 inches long x 4 inches thick * King: 76 inches wide x 77 inches long x 4 inches thick * Cal King: 70 inches wide x 80 inches long x 4 inches thick Memory Foam Do's and Don'ts: 1. To maximize memory foam expansion; remove from packaging within 72 hours of receipt. 2. This product arrives very tightly packed. Please unwrap and allow 48 hours for this product to return to its original shape. 3. Being sealed in plastic packaging sometimes traps odors. A few hours of airing usually removes the odor. 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.