The Pocket Flex is a 1000 independent pocket spring mattress with memory foam. Features a zipped cover that can be removed for washing. Small Single (2'6" x 6'3"), Single (3'0'' x 6'3"), Small Double (4'0'' x 6'3"), Double (4'6" x 6'3"), King Size (5'0'' x 6'6"), Super King Size (6'0'' x 6'6").