Abstract: An anti-G pressure garment system incorporates an inflatable pressure bladder covering portions of the wearer's body. The bladder is provided with an area made of a first material formed by a flexible air and liquid impermeable, vapor permeable, micro-porous material that facilitates the passage of water vapor therethrough whereby pressurized gas will be retained by the said bladder and water vapor adjacent said inside layer will pass through said material into the interior of the bladder. The bladder also includes a second area made of liquid impermeable, air and water vapor permeable material so that the second area permits a preselected amount of controlled leakage from the bladder to the wearer while maintaining adequate pressure in the bladder.