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Iron Heart 777S-21MB - Slim Tapered - 21oz Mad Black
Iron Heart 777S-21MB - Slim Tapered - 21oz Mad Black
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Iron Heart

777S-21MB - Slim Tapered - 21oz Mad Black

$420.00 $315.00

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Garment Measurements | Virtual Size Chart


The Iron Heart IH-777S-21MB in Mad Black is a mid-low rise Super Slim Tapered Fit with a moderate seat and thigh with a strongly tapered leg and narrow hem. This jean features the Iron Heart signature 21 oz. heavyweight, right hand twill Japanese Selvedge Denim, and is loomed with two twisted yarns to add bulk in a low tension weave that will become amazingly soft with a natural drape while retaining its form. A hallmark base fabric within the Iron Heart collection, this 100% cotton denim utilizes the vintage shuttle looming of the dual yarn method to produce a slight slub on the inside weft that softens to the body and gives this remarkable heavy weight denim an unmatched wearability. The 'Mad Black' development is Iron Heart's new overdye recipe at the fabric state that undergoes two different processes, twice each, to deeply saturate the black sulfur dye into the rope dyed indigo warp and natural weft to produce a consistent black denim that will evolve slowly with a unique, crisp black and blue fading pattern. Finally, it's topped with an ultra heavy natural vegetable tanned embossed leather patch, heavy duty canvas twill pocket bags, embossed copper riveting on the front pockets, hidden rivets on the back, a zinc button fly, and a chainstitched waist, seat and hem. This garment is sure to be a new classic using signature IH details and a fresh fabric development with a contemporary mid-rise tapered slim fit for the gent who lives his history in the present. Built for the motorcycle community and over-engineered to start, it tests the limits of what actually can be artfully woven and sewn. The Iron Heart 777S in 21 oz. Mad Black has supreme character to rival any in its weight, yet will knock out and ride over the competition as a black magic craft colossus.


  • Super Slim Tapered - 777 Fit 
  • Mid-Low Rise, Slim
  • Moderate Seat and Thigh, Tapered Leg w/ Narrow Hem
  • 21 oz. Japanese Low Tension Selvedge Denim - Signature
  • Sanforized - One Wash
  • Black Dyed Selvedge Line
  • Double Twisted Weft Yarn
  • Proprietary Double Overdyed
  • Indigo Rope Dyed Warp & White Weft
  • 100% Cotton
  • Zinc Button Fly
  • Engraved Copper and Hidden Rivets
  • Heavy Duty Canvas Twill Pocket Bags
  • Fully Lined Back Pockets
  • Embossed Natural Leather Patch
  • Chainstitched Waistband, Yoke, Seat & Hem
  • Bartack Reinforced
  • Rolled & Tucked Belt Loops
  • Made in Japan


Model Measurements: 5'11" | 165 lbs. | 40" Chest | 32.5" Waist - Wearing Size 33

The 777S-21MB runs on the small side of Iron Heart sizing, and we suggest sizing to your Actual Waist Measurement. Made with a sanforized, once washed, and overdyed denim, all shrinkage is removed. With regular use, one can expect up to 1” of stretch in the waist over the long term.

We recommend consulting our Sizing Guide and using our Virtual Size Chart.

Please feel free to Contact Us for additional assistance.

About Iron Heart

After 20 years of working in the garment industry in Japan, Shinichi Haraki established Works Inc a.k.a. Iron Heart in 2003 as a heavyweight Japanese clothing brand, initially aimed at the Japanese motorcycling community. Over the years and in partnership with the UK heritage community, the brand has become the pinnacle definition of bullet-proof garment construction. Originally made for bikers, Iron Heart pushes the design and construction of the clothing to the limit of what can actually be woven and... View All Iron Heart Products