David Archy Men's 4 Pack Comfort Breathable Linen Trunks Made of 95% Linen and 5% Spandex Linen fabric is heat conductive, so it feels cool to the touch. By creating the underwear out of linen fabric, the body can manage its temperature and dissipate excess heat. As Linen fibers are smooth, moisture moves easily along them, which keeps you dry all over the day. The natural linen fiber can prevent bacteria effectively. U-style pouch design provides you the enough space for movement. The long washing labels are easy off. Machine washable.