New HMX Bi-Component Waterproof Breathable Fabric Technology is Here. Browning introduces new high performance, Bi-Component HMX waterproof and breathable fabrics. HMX is different because it combines the advantages of the two most widely used technologies. Hydrophilic Monolithic systems do not transport perspiration vapor, but only the liquid perspiration formed when the vapor condenses. Hydrophobic Microporous systems transport vapor, but do not transport condensed perspiration. By using a Bi-Component System we utilize the advantages of both technologies to move both water vapor and condensed water to the outside of the garment keeping you protected from internal moisture. At the same time, HMX totally prevents water entry from the outside. The revolutionary Bi-Component technology found in HMX fabrics provides the level of protection and comfort you have come to expect from Browning Technical Clothing, The Best There Is.