My husband is 5'8" and 11 1/2 stone and I am 5'4" and 12 1/2 stone. My husband is currently building a solid oak bed stead which will have a slatted base but having read your website I have told him that he will be best to put a sheet over the slats. Our current mattress was quite hard so we purchased a memory foam topper, however I am now feeling aches and pains in my back and really need to change to a more suitable mattress. I struggle with the heat at night and my husband does not like to be cold. We are looking to buy a King size mattress. Can you suggest the most suitable for us please.? Also how long does delivery take?