These Base Layer Bottoms are designed to not only keep you warm, but remain comfortable during high-activity. There's a little spandex in there to give them some stretch, plus a gusseted crotch for comfort while crouching in the field or going for an early-morning walk. Designed to quickly wick away sweat and dry fast, which helps regulate your body temperature. Comfortable, warma |layer up the right way! Stretch fabric moves when you do Moisture-wicking, fast-drying material helps regulate body temperature 1.5"w. brushed jacquard elastic waistband with Guide GearA(R) brand Safety-stitched inseam for comfort and durability 1-piece construction with no sideseams Pass-through fly Imported Call it "worry-free warmth". So get your Guide GearA(R) Base Layer top today!