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Constructed from FAMOUS POLARTEC POWER DRY MATERIAL. This is a level 1, "silk weight", thermal base layer that was used in the US Army. Base layer is moisture wicking, breathable and lightweight. It helps keep you warm and dry while moving around and sitting. The level 1 base layer is very durable and can be worn like compression clothing with it tight against your skin or more loosely depending on your preference. The Gen III ECWCS design allows moisture to escape and at the same time has water-resistant properties.