That right there is what I was talking about. Except I Just rigged my own. The slip knot (prusik) used to go up and down is a very easily tied knot



All those cowbell carabiner covers and reflective stuff in the rope are bells and whistles I can do without. My carabiners are coated with the same stuff (tool dip) I put on my shop tool handles so they don't clank and the reflective rope would be your choice if you think you need it. But the idea of it is fantastic since you are locked in on the way up, transferring into and out of your stands and on the way down. If tied properly the prusik knot slides easily.