Having been a person who's always enjoyed doing things barefoot, I used my nike frees when I started playing tennis again recently. I quickly learned that this was too risky, as it is hard to maintain high levels of conscious control over one's reflexes - once or twice an hour I'd roll my ankle because of a reflexive signal from my brain to veto a commitment to the wrong direction across the court. For example, when coming down off a split step I'd choose a direction of movement, only to suddenly realize it was the wrong one, and I'd find my leg muscles in a state of confusion which could sometimes lead to unhealthy torques.Or my center of gravity would be too high when changing direction, or the base of support wasn't stable enough to hold traction against the direction of movement. So I bought a pair of ballistec 1.3's and am very happy with them the two times i've test driven them. However something is bugging me: Yes the increased ankle support prevents those quick loads and unloads from being absorbed by the ankle, but that momentum has to be rechanneled somewhere, and my thinking is that the next stop is the knees. Is this a valid concern? My plan is to pay attention to the kinesthetic/proprioceptive feedback next time I make a quick unload and assess the impact on the knees. Are there any strategies I can use to most safely rechannel any sudden surges in momentum?