dont expand. basically a flat piece of foam

I use them behind my back for low back pain. They work very well for this purpose.

Firm and comfortable I have bought a few already.

Super soft and comfortable!!!

Very comfortable, stays cool

Great support for my neck. Love it!

nice and cooling. could be a litle thicker.

they are comfortable and cool, unlike the purple ones

i am sleeping so much better since getting these pillows

The best pillow I’ve ever had in my life. And I’m picky