This version of the 633 jean has been overdyed black with a fugitive pigment dye which is an unstable and un-permanent dye that fades to later show the indigo denim underneath. Essentially this is a denim that begins black and fades to indigo in high friction areas, or what the Japanese call the "atari" fade. Iron Heart released a set of overdyed jeans (using their flagship 21oz sanforized denim) years ago, those turned out to be some of the best looking worn jeans we've ever seen from the few people that got their hands on a pair, we expect no less from this jean. The 633s fit from Iron Heart has turned into one of our best selling jeans at Self Edge, it's a perfect straight leg jean with a heavy taper for a small leg opening. Disclaimer: These jeans are made of denim that has been overdyed, these will not shrink at all once washed due to the overdye process which gets rid of all the shrinking that may take place. Please keep this in mind when choosing your size. The denim will also stretch in the waist up to 1" after approximately 30 wears. Iron Heart 633s-OD Overdyed 18oz Denim Jeans - Straight Tapered