Iron Heart 777S-UHR 21/23oz Denim (Super Slim Tapered Fit)

Size Guide

U-H-R, as known as 'Ultra Heavy Raw' denim from Iron Heart for you to enjoy!

This newest specially developed denim from Iron Heart is 21oz weight in raw condition, which is slowly woven from a vintage shuttle loom, and features a mildly uneven textured surface. With a first wash, the denim will shrink and end up at the ultra-heavyweight 23oz! This will age to a higher contrasted look than their signature 21oz denim over time. 

Construction-wise this pair has been given the classic Iron Heart treatment. Heavyweight cotton twill has been used for the pocket bags, as well as lining on the back pockets to ensure they remain durable for many years to come! Iron doughnut buttons have been used for the fly, as well as hidden back pocket rivets for added durability! The red selvedge I.D has been incorporated into the fly construction and coin pocket for some added tasteful details!

If you are looking for some ultra heavyweight denim that can age magically, this is a perfect one!

  • 100% Cotton
  • Japanese 21/23oz red selvage ID UHR (Ultra-Heavy-Raw) denim
  • Grand indigo dyed
  • "Iron Heart" iron buttons
  • Hidden back rivets
  • Ultra-thick cowhide leather patch
  • Selvage Fly construction
  • Cotton twills linings in back pockets
  • Poly/Cotton stitchings
  • Low rise/Slim Tapered fit
  • Made In Japan

NOTES: This denim is sanforized, however, it remains less than 3% shrinkage with different ways of soakings/washings.

Cold Soak: 0.5'' in the waist ; 0.75'' in the inseam
Warm Soak/Cold Machine Wash: 0.75'' in the waist; 1'' in the inseam
Warm Machine Wash: 1'' in the waist; 1.5'' in the inseam

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How We Measure

Pants and Shorts


With the major buttoned up open the jeans and lay them flat like shown. Measure from the front where the major button closes to the back belt loop. Then double this measurement to achieve the waist measurement.

The way we measure is different from 'Side to Side', If you are not used to our method you should downsize by 1 inch.

For example, side to side measurement for The Flat Head 3002 waist is 28inch and using our method 29.25 inch.

Front Rise:

With the jeans lying flat measure from the crotch bar tack to the top of the waistband. 

Back Rise:

Spread out the crotch so the bar tack is visible, then measure from the crotch to the top of the waistband.


One inch down from the crotch measure flat across to the other side.


Flatten the leg and measure along the inseam from the crotch to the leg hem. 

Leg Openning:

Measure straight across the hem from side to side.



Lay flat then measure from the shoulder's edge to the other shoulder's edge.


Lay shirt flat and measure from pit to pit.

Sleeve length:

With the sleeve flat measure from the shoulder to the cuff.

Arm hole openning:

Measure from the shoulder down to the pitt.

Vertical length:

With the shirt facing down, Measure from below the collar to the bottom hem.