out of the air bag through passageway 20 through open check valve 57 fig4 through interior passageway 53 into arterial passageway 30 through subpassageways 32 fig1 and 2 and out of apertures 34 into shoe 10 air will also try to flow out of air bag 14 through passageway 26 but will be prevented from doing so by the closing of check valve 56 in interior passageway 52 when pressure on air bag 14 is released check valve 57 will close check valve 56 will open and fresh air will be drawn into the air bag through passageway 20 from opening 22 such action continues pumping fresh air into shoe 10 and expelling moisture and warm air through openings in the shoe or around the foot of the wearer fig5 illustrates the setting of air flow selector switch when it is desired to pump air out of shoe 10 this mode of operation is particularly desirable when the wearer is in rainy or dusty conditions pulling air through openings in shoe 10 and around the foot of the wearer tends to filter out water drops and dust particles here it can be seen that rotatable member 44 has been rotated 180 degrees from its position on fig4 this puts interior passageways 50 and 51 in working position and has the effect of reversing check valve action now when air bag 14 is compressed check valve 55 will close and check valve 54 will open and air will be expelled from the bag through passageway 26 through check valve 54 through internal passageway 50 to passageway 20 and out of opening 22 when pressure on air.