Iron Heart - 634S Indigo 21oz

Size Guide


For clothing sizing information, please read the description of the given product carefully.

If no sizing information is available, please do not hesitate to ask us before purchasing.

We will do our best to respond as quickly as possible.

Have a sizing question? Let us know.


Measure and compare, before purchase. Below here, you can see how we measure our jeans.

Measure your jeans like we do.


There is no “normal size”, because there are no “normal feet”. Feet in general are either narrow or wide and are all three-dimensional. Shoes, however, are normally produced only in different lengths, because consumers nowadays demand many colorways and designs, rather than varying fits.

In the 1960’s many shoemakers produced a far smaller number of shoes and then produced them in several widths (example: B, D, E, EE etc). Note: Width is not to be confused with a slimmer shoe silhouette.

Do notice that US producers convert US sizes to EU sizes differently, so it can be a help to focus on CM (centimeters) or USA (US).

Sneakers often have a slimmer silhouette than boots, so many will go down half a size from their sneaker size to their boot size.

Narrow and normal width (D):
All boots, shoes and sneakers.

Wide width (EE):
Red Wing 8111EE or 875EE and all Danner boots, as they are all in width EE.

This document only serves as a general guideline. If possible, stop by and try your new boots on. If not possible, drop us an email at 

634 is Straight Cut and is one of Iron Hearts most Classic fits.

The Indigo 21oz Selvedge Denim is Iron Hearts signature denim. Iron Heart weave under fairly low tension to achieve an amazingly soft but super thick denim which moulds and drapes particularly well. The weft is quite slubby and the denim has a lovely 'hand made' feel to it. Fades with fairly low contrast.

  • Iron Heart classic Straight Cut
  • Super heavy but super soft 21oz indigo denim
  • Button fly and hidden rivets
  • Poly/cotton constructional stitching
  • Sanforized and one-washed (you probably can't see it), so expect little or no shrinkage (with reasonably careful washing and drying). The waist will stretch approximately one inch with wear. All other dimensions that are put under pressure will have a tendency to stretch proportionately to the stretch in the waist
  • There is no need to soak these before wearing
  • Come in one lenght, so if you need a shorter length, make a turn-up.
  • When selecting your size, please check actual measurements you need
  • Made in Japan

Model size: Height 183 cm, weight 75 kg and he is wearing size 33.

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