Iron Heart has announced the release of their 5th anniversary denim jeans, and what a heavy weight it is. For the anniversary jean, the denim was so intense that it took over 20 versions to get it right. The final product sees denim that is extremely rigid and heavy, as well as unsanforized, which is a first for Iron Heart. The denim starts out as a rigid 21oz denim, once soaked the true indigo color really comes out and the post-soak weight of the denim becomes approximately 23.5oz, easily the heaviest fabric that Iron Heart has ever done. These jeans are projected to fade quicker and with more contrast than all previous models from the company. The Iron Heart 5th Anniversary Jeans will be limited to 400 pieces worldwide, and will be available for sale starting 10AM (PST) on 18 June on the Self Edge online store. Detailed pictures available after the jump.