I have changed my previous rating of 1 star to 4 stars after Vero Monte replaced the socks that I received that did not have silicon in the heal.  The new socks seem to stay up and I like the thickness of them.  I receive 4 other pairs of socks from the company with the replacement socks.  They were ankle socks with lace at the top.  I gave them to my great niece who was thrilled to get them.