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These authentic British military surplus suits have a mix of dates from 1981 - 1988 The Mk.III was designed to allow the trapped air to move around unlike most NBC suits of various other nations. The complete suit is constructed from two layers. The outer material is made of monacrylic fibers reinforced with polyamide fibers. It has a strong, hard-wearing outside surface. The monacrylic fibers ensure high fire-retardance. A silicone treatment is applied to make the garment shower-proof, and to permit rapid spreading of liquid chemicals, which in turn speeds up evaporation. This reduces the loading on the second layer, whose main function is to act as chemical barrier. The inner fabric is based on activated charcoal as a means of protection against toxic gases and vapors. Since this material alone is not sufficiently strong, it is bonded to non-woven fabric which is flame-retardant. A fluorocarbon finish is applied as an oil repellent, thus acting as a further barrier to toxic liquids. This combination of repellents represents a chemical barrier which is highly efficient, yet air-permeable and thus imposes low heat stress. This liquid control system formed by a wicking layer over an oil-repellent layer permits the incorporation off less charcoal than in other systems, which in turn results in a lighter garment and smaller package size.