If you have never had a mattress heater youneed to order this one.  My previous sunbeam went on me after 15 years so I was very particular when choosing a replacement, this one is perfect.  I have a sleep number mattress so the pockets are plenty big enough to accommodate the 17" mattress.  The dual controls are great as my husband does not like too much heat on his side.  The pad heats up quickly and has automatic shutoff so no worries if you leave home forgeting to turn it off.  the fabric is good quality, I wash it on cold/delicate and let it air dry.  Great purchase