Open coil spring unit with hypoallergenic filling and finished with hard wearing fabric. 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"), 2'6''King Size (5'0'' x 6'6"), Super King Size (6'0'' x 6'6").