I'm a side sleeper.  I bought the original Casper pillow first.  It is fluffy and great but did not give me enough support.  So I bought the foam pillow.  It is great too.  Now I use both pillows.  The foam on the bottom and the original on top of it.  This gives me all the comfort and support that I need for a good night's sleep.  I also have a CPAP machine and wear a full face mask all night. These two pillows support me better than any special foam pillows for CPAP mask wearers or really any other pillows I've ever had.  Thanks Casper.