i havent gotten shinbang since i got the booster, and the flex on my boots feel so much smoother, also you can hook the end of one the the base of the other to carry your boots.
loved the booster, have them on all my boots
dosnt really matter its under your pants
well priced, deffinetly worth the money
they have a stiffness guid on their website, by following this guide you cant get the wrong stiffness
it adds a constant tension to your boot, resulting in a much smoother flex on your boot, while also reducing shin bang