Twin XL size Abripedic 10" Memory Foam Mattress 38" wide x 80" long, 25 year limited warranty Twin XL size : 38 inch wide x 80 inch long x 10" inch thick 10" Thick with 3 inches of 3.5 lb memory foam comfort layer and 7 inches of polyurethane foam. 25 years limited warranty The soft, luxurious zip-off cover is machine washable and resistant to allergens and mites.