FF Supertone™ Blue – new muscle-toning, energizing, shock-absorbing sneaker. The all-leather FF SUPERTONE sneaker has a cool, ageless, classic, go-everywhere style, and cleverly conceals the toning sole (so you can wear it without anybody knowing you’re getting a workout). It has the same famous thigh muscle-activating, foot-flexing, bottom-benefiting biomechanics built-in, but it doesn’t look like a shoe that’s ‘good for you’.