I say 'surprisingly' because the mattress is VERY soft, and because we're using XL Twins on a King adjustable bed, there's a lot of movement transfer when the other person moves or gets into bed. That seems like it would make for an uncomfortable mattress, but my husband and I have found that we sleep much better--more comfortably--than with our previous memory foam mattresses. Of course, time will tell how they wear/how long they last, but the price was right, and I would buy again.