Comfort Boost 2.5 in. Twin XL Memory Foam Mattress TopperUpgrade your mattress with adaptive support and soothing comfort. Air channel memory foam enhances breathability, while relieving pressure points. Memory foam gently encourages total body alignment, keeping you more relaxed for deeper sleep throughout the night. the foam is infused with antimicrobial protection, so the topper feels fresher for years of restorative rest. Its a combination that fosters well rested nights, every night. Size: twin xl.