If there’s one particular fabric most commonly associated with Iron Heart, it be our signature 21oz selvedge indigo denim. It’s now been well over two decades since Haraki san debuted the first pair of 21oz jeans—and whilst this may no longer hold the title of “world’s heaviest denim”, this fabric sparked a heavyweight revolution and remains a firm favourite with denim enthusiasts.

This medium-tension weave utilises a double-twisted weft yarn, resulting in one of our softer heavyweight denim, providing comfort and breathability with a relatively gentle break-in period. Woven with a rope-dyed indigo warp yarn and a natural weft, this denim will fade naturally with wear and washing.