The invention disclosed herein relates to an elastomeric article, such as a glove, containing an elastomeric material such as latex and a coating layer formed from an aqueous dispersion containing a composite of a silicone-modified polymer, e. A method of forming the crystal is also disclosed, along with some resulting devices that take advantage of the microwave frequency capabilities of devices formed using substrates according to the invention. A sensor is packaged with the pump, and the sensor is in fluid communication with the fluid bladder and is operative to determine a pressure within the fluid bladder.