This mattress is barely 12" once full, but I'm not loving it. There is way too much bounce to the mattress, and it is too "squishy" and soft. In reading the description and looking at the cross-section photo, I ASSUMED that the upper white area was all memory foam - WRONG. You can easily feel the coils from the top of the mattress. I should have known better and not ordered such an inexpensive mattresss. I've had to purchase a memory foam topper to TRY to make this feel better!