I wanted to use this mattress pad on a waterbed so sweat doesn't stain/damage the Full Motion Mattress. I used padding under the mattress topper but it kept wrinkling and was uncomfortable. I haven't used it long enough to know how effective it is, but if it protects against bedwetting, spills, etc., it should work just fine. It was very difficult for me to put it on the mattress, partly because with the elastic tied around the perimeter it was impossible to tell which side was which which was on top and it seemed like it was for the king was too small. After many tries I finally put it on and it stayed in place. Since this is a soft mattress topper, the thickness doesn't matter. It's probably easier to climb onto a mattress that doesn't move, but a few inches more length would be nice.
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