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Real USMC issue Polartec Coyote Brown thermal underwear bottoms. These are the silkweight ones that are real thin but add a lot of warmth without a lot of bulk.
These are real Polartec bottoms made in the USA. Look at the price an outdoors or hunting store will charge you for a name brand pair of thermal bottoms and you will find more expensive ones that are imported and not made in the USA.