Our AS5 mattresses are the thickest and heaviest beds we offer. The classic AS5 memory foam mattress weighs as follows: A twin size memory foam mattress is 53 pounds. A twin XL size memory foam mattress is 57 pounds. A full size memory foam mattress is 73 pounds. A queen size memory foam mattress is 88 pounds. A king size memory foam mattress is 111 pounds. A California king size memory foam mattress is 110 pounds. The AS5 hybrid is even heavier than the original AS5: A twin size hybrid mattress is 71 pounds. A twin XL size hybrid mattress is 80 pounds. A full size hybrid mattress is 97 pounds. A queen size hybrid mattress is 113 pounds. A king size hybrid mattress is 143 pounds. A California king size hybrid mattress is 142 pounds.