125606 thermal-underwear-bottoms Soft brushed microfiber fabric provides comfortable warmth for all day wear. Flat no rub seams feels smooth against the skin and helps prevent chafing. Size up for a roomier fit. For all-over warmth, pair with our matching thermal crewneck. 86% polyester/14% spandex X-Temp? technology is designed to adapt to temperature and activity to keep you cool and dry for all day comfort.