Artemisia - 8" Twin XL Extra Long Memory Foam MattressMade of memory foam and supportive high density base foam, our 6 inch mattresses deliver optimal comfort to maintain proper sleep posture while offering targeted support to keep the spine in its natural position. Works well with different types of bed bases, including adjustable bases and box springs. Specifications Dimensions 39"W X 80"D X 6"H Size 603 Feat1 Available Sizes: Twin, Full, Queen Feat2 Construction Layer: 1 Memory Foam, 5 Standard Foam