Iron Heart Iron Heart's parent company Works Incorporated, has been in the denim manufacturing business for over twenty-five years. Over those many years they have mastered the art of making denim that is not only extremely heavy, but very comfortable to wear considering it's weight. They leave no detail unturned, from the sheen of their beautiful denim to the extremely thick leather tag their denim screams of overindulgence. The denim is constructed of 100% hand-picked Zimbabwe cotton, known for it's unusually long fibers, giving this denim an even look but a very soft hand.  Most jeans weigh around 14-15 oz. this Iron Heart jean is 21 oz..good for winter wear! Iron Heart: 634S Straight Selvedge The 634S by Iron Heart is their flagship model that brings their signature 21 ounce selvedge denim to a straight cut jean. These are made with hand picked Zimbabwe Cotton that is known for it's unusually long fibers which give this denim a super soft hand. Iron Heart denim is known for it's ultra sheen and extreme durability due to it's heavy weight. Almost any other company attempting to produce denim this heavy would end up with a very stiff and rigid fabric, where as Iron Heart's denim is suprisingly pliable considering it's weight. The cut on the 634S is a golden one, it's not too slim and not too relaxed, that perfect in between for a flattering look from top to bottom with a perfect sized leg opened for stacking or cuffing. These don't shrink all that much because the denim is sanforized. Japanese Selvedge 21 Ounce Denim Zimbabwe Cotton Hidden Rivets Super-Duper-Thick Leather Tag Straight Leg This is my heaviest pair of jeans at 21oz. Really like the texture and the tough feel. Even though it is 21oz, when wearing the jean, one will not feel its weight as it is well cut and design.Great  jean!