Featuring moisture-wicking technology, anti-odor treatment and a breathable mesh fly front to keep workers comfortably fresh, dry and warm all day.The 180g polyester-spandex performance material provides warmth without the constricting or bulky feel often found with heavyweight base layers. 6481 M Black Lightweight Base Layer Pants Flatlock seams and a tag-less interior means no irritation and chafing. Unlike other base layers, these pants are designed to sit slightly looser on the skin to enhance breathability and provide an airgap for added insulation.