Iron Heart was originally made for bikers, and even today that focus guides design and construction of the clothing. Confident that the clothes appeal to a variety of owners, Haraki-san conceives of them to be worn by riders and for their preferences. Iron Heart garments are in the main made from heavyweight fabrics, designed to be durable, and to some extent protective for motor bikers. Iron Heart clothing is classic in materials and styling, using mostly flannels, denim and chambrays for shirts, and basing jackets on time tested military or riding favourites. Some designs – for example the 25oz XHS (extra heavy selvedge) denim jeans - are at the limit of what can actually be woven and sewn: “over-engineered is our starting point.”