Regarding Calf hooks or Velcro, I used Velcro on the outside cover strip like Dannys build. Also to keep them from moving around on me i used Velcro on the top front of my boots and the inside front of the calve armor.. Walked around the house for 20 min didn't budge, so I went for a run for 10 min with them like that didn't move at all... Neighbors were a little confused lol...