>>1635232Flat pedal shoes should be both hard and stiff enough to achieve good power transfer, and also have a soft enough outsole surface for the pins to effectively grip on to. This can be achieved with a soft outsole material, and a stiff and ridgid insole material. Your feet should feel locked in with no slip. Your shoes should only disengage from the pedals when you want them to, or if you fall off the bike.
