 They hold your foot. I don't even know how to describe it. And they have so much support that your knees, your back don't bother you at the end of the day. You could have a standing job in these daggone things. They're $25 right now. Six-piece style sets, $25. Premium MyPillows, $25. Go to MyPillow.com. Click on the Radio Listener Special Square and use the promo code JESSE.