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Gen III Level 1 & 2.....Lightweight and Midweight thermal underwear. Quality thermal underwear. Gen III Level 1 is 100% Polyester and Gen III Level 2 is 93% Polester/7% Spandex. Thermal bottoms, zipper thermal tops and balaclavas You can't get better thermal underwear. The
Gen III Level 1 meets US MIL SPEC
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