Iron Heart - IH-634S 21oz Selvedge Denim Straight Cut Jeans Indigo

Where it’s made: Made in Japan
What it’s made from: 21oz Japanese rope-dyed indigo selvedge denim, woven with double-twisted weft yarns
Fit description: Classic straight cut, medium rise, sanforized and one-washed — little to no shrinkage

The IH-634S is Iron Heart’s flagship jean, designed by Haraki-san himself and crafted from their legendary 21oz indigo selvedge denim — a fabric that has become synonymous with the brand’s identity. Built for durability and comfort, this denim is rope-dyed with an indigo warp and natural weft, producing rich, slow-fading hues that develop depth and character over time. The fabric’s heavy weight, balanced with a surprisingly soft feel after a few wears, offers both structure and wearability year-round.

The 634 cut is Iron Heart’s most classic fit: a medium rise with a straight leg, delivering a timeless silhouette that works across styles. Key construction details include hidden back pocket rivets, a button fly, belt loops sewn into the waistband, and poly/cotton stitching for extra strength.

Sanforized and one-washed, these jeans will not shrink further, though the waist and other areas will stretch approximately one inch with wear.

Jonas, 183 cm and 75 kg, wears size 32.