A shoe sole includes a chamber which is inflated by a pumping device via a connection tube. The connection tube includes a first valve to prevent air from flowing back into the pumping device and an inlet tube extends from the pumping device to introduce air from outside into the pumping device. A plurality of outlets are defined in a distal end of the connection tube and located corresponding to toes of the wearer. The connection tube has a neck portion which defines a narrowed path in the connection tube so that air is stopped at the neck portion to inflate the chamber, when the pressure of the air reaches to a pre-decided value, air passes through the neck portions and blows out from the outlets to cool the toes of the wearers.