These thermal Under Armour Tac Base Pants (Tan) are so warm and comfortable, even your grandpa will want to trade in his trusty old long johns. Their unique negative grid locks in monster warmth without adding any extra weight, which is great for staying fast and agile. Smooth on the outside, warm on the inside, you can use these pants as a layer under your uniform or outdoor exercise gear. The bottom line is this is the precise thermal base layer you will want to wear on every cold weather mission or outdoor activity.