I purchased these to wear with my Sperry Top Siders.  They fit as expected and are hidden when my shoes are on.  The socks/liners have silicone on the inside of the heel to help prevent the sock from sliding down; however, this is still a problem for me.  The socks almost always end up coming off of my heel and bunched up in the bottom of my shoe :(  I wish there was a solution for this.