this is like sleeping in a cooling cloud!! I previously had a 4 regular memory foam topper,  but had read that the new gel toppers ran much cooler.  This totally exceeded my expectations - from the moment I unrolled it out of the packaging, it was perfect! My regular sheets fit over the topper perfectly,  and its super comfortable while still offering support for my back which is very important as I have scoliosis.  Usually,  I wake up stiff and in pain.  Since using this topper,  my morning pain has decreased greatly.  Super pleased with this purchase!