The rate of moisture vapor diffusion through the fabric is determined according to the Simple Dish Method, similar to ASTM E96-80. A sample is placed on a water dish (82 mm in diameter and 19 mm in depth) allowing a 9 mm air space between the water surface and specimen. A vibration free turntable carrying 8 dishes rotates uniformly at 5 meters per minute to insure that all dishes are exposed to the same average ambient conditions during the test. The assembled specimen dishes are allowed to stabilize for two hours before taking the initial weight. They are weighed again after a 24 hour interval. Then the rate of moisture vapor loss (MVTR) is calculated in units of g/m²-24 hours. A higher MVTR value indicates there is a greater passage of moisture vapor through the material.