The new Millennium Stirrup uses a fixed angle cam in the center that holds your stirrup straps apart. This gives a heels down ride. When pressure is added to the stirrup, the strap pulls the cam inline with the pressure applied to the strap. The reaction time is immediate in taking your foot and leg out to keep you in the saddle if the cam is tilted forward. This makes it almost impossible to lose a stirrup. The unique feature of the stirrup is it contains front and rear tabs that replace a stirrup hobble strap. Its very easy to twist your end strap to set the stirrup 90 degrees out as pictured.