They feel marvelous, they wont flatten out. As far as I can tell good for both side and back sleepers.
I WAS HAVING UPPER BACK AND NECK PAIN AND I BOUGHT A NEW STEARNS AND FOSTER BED SET. THEN I WENT LOOKING FOR PILLOWS AND REALLY DID'NT FIND ANYTHING I LIKED UNTIL I TRIED THIS PILLOW IN A BOX AT THE END OF THE BED I BOUGHT. WOWSER!!! I KNEW I WOULD LOVE IT. A LITTLE PRICEY BUT THEY WERE JUST ON SALE TOO. I GOT A BIG HEAD AND SHOULDERS, THIS PILLOW SETTLES TO JUST THE RIGHT HEIGHT! HEY TRY IT, DON'T LIKE IT RETURN IT BUT I THINK YOU WILL LOVE IT.
Pillows are great for support, but the 'down proof' fabric is not at all down proof, many, many dozens of down feathers come through the fabric. These covers are supposed to be washable, but I would not even think about washing these.
Pillow supports neck and head perfectly.
I am a side sleeper and I had been having problems with a stiff neck. I finally broke down and bought this pillow. It is wonderful!! No more stiff neck!