The clear PVC material used in Airchamber systems is 0.15mm. This is approximately 0.01 inches or 6 mil. Plastic sheeting is measured in mils - a unit of measure. It's important to note that a mil is not the same thickness as a millimeter. A mil is a measurement that equals one-thousandth of an inch, or 0.001 inch. One mil also equals 0.0254 mm (millimeter). For comparison, a standard rigid plastic credit card is about 30 mils. 6 mils is incredibly strong, flexible, and has a high impact tolerance.