Originally Posted by RiDeC58
I don't understand why this is so. If you strap the same size boot onto a "mechanical ankle" and flex with a force measuring device through a specific range of motion you should be able to quantify, in a standardized way, not only the overall stiffness of the boot but also the "flex profile" of the boot. In other words you should be able to describe not only the stiffness but also how stiff it is initially, how quickly the stiffness increases with further flexion etc. I don't believe this would be technically difficult. I just don't think the will to develop and participate in the process exists in the industry.
The problem is that the size and shape of the foot and lower leg effect flex. You could come up with a "standard" fake foot and leg, but the figures you get might not transfer to the real world. Someone with a slender lower leg and a high instep will experience more stiffness in a given boot than someone with a burly leg and low instep. Snugging a boot cuff up tight around a slender leg inhibits flex. So does a high instep, as the lower cuff strap can't ride over the instep area as easily when the instep is high. On top of this, some boots are affected more by the cold than others. I wish it were otherwise, but I don't think there is any way to standardize flex, and if there were you would have to standardize at a temperature below freezing to make it meaningful. LewBob