To provide briefs for men that can take out the male organ from either of the left side or the right side of a front opening, in addition, has a function of warming the lower waist and the stomach or belly.

Two pieces of openable cloth 4 are allowed to be tightly adhered symmetrically from the center of the front face of briefs 1 so that these pieces may not be overlapped or arranged separately at a proper interval. In addition, a front cloth 2 is arranged in the front face of the openable cloth piece 4 and the upper edge of the front cloth 2 is sewed to form a right and a left openings 16 and the root of the thigh part of the briefs is sewed from the lower edge of the front cloth 2 to form a bulge 7. In addition, an extensible band 8 is sewed to waist lines on the upper edge of the openable cloth pieces 4, the front cloth 2 and a back cloth for covering the buttocks. The extensible band 8 is prepared by shrink-sewing cotton or chemical fibers to form gather pleats and building in rubber strings in the gather pleats for enhancing the extensibility of the extensible band 8. In a preferred embodiment, a material halving far- infrared radiation power, for example, ceramics, tourmaline, or the like, may be incorporated into the fibers such as cotton or chemical fiber.