This bed is NOT the size claimed. A standard king is 76" X 80". This mattress is listed as being 76" X 81.5". In reality, it is only 76" x 78", 3 1/2 inches shorter than advertised and 2" shorter than the queen bed that I just replaced, which was an industry standard 80" long. How does this happen? In reading other reviews, apparently this is something that Serta has started doing in recent years. If you need a king mattress that is actually king length, this is not the one. Rated 2 stars instead of 1, because despite being too short (a major downfall), the delivery went smoothly and it's actually comfortable, just looks a little silly in my king frame with exposed slats.