Once your shin is against your boot buckles it's all boot flex, at this point the booster strap isn't doing anything. So the resistance we get from the booster is in that movement we have inside our boot cuff before we hit the front of boot cuff. How much resistance and transfer of pressure do we want here? I see this as the real question. Maybe you want alot, maybe a little. As Atomicman has said it's cheap, so no worries. I use them and I really like the progressive flex into the front of boot I get with them. later, RicB.