In tests conducted by the Hammacher Schlemmer Institute, this allergen barrier was rated best over other bedding for softness, shrinkage, allergen protection, and strength. The bedding scored highest for softness and shrinkage and was highly rated for allergen protection and strength. Ten panelists commented that the bedding had "a soft, durable, luxurious, and high thread count feel" and that "the sample did not shrink." Unlike other barriers that only lay on top of a mattress, this barrier encloses an entire mattress, as deep as 15" for twin, full, queen, and king sizes. Machine washable and dryable, the bedding does not use laminates or plastic, so it will not make noise as you shift into comfortable sleeping positions. Imported. 15" Deep King Mattress Casing. 80" L x 78" W x 15" D.