The Iron Heart IH-634S-SLB in 16oz Slubby Japanese selvedge denim is available at Rugged Gentlemen Shoppe with fast local shipping and easy returns. Due to limited production, certain sizes can be hard to find once they sell through. If your size is currently available, it may be worth securing it while stock lasts.

A first for Iron Heart, a slubby denim. This deep indigo selvedge denim has a really uneven hand on both the face and the reverse (think off the scale loom-chatter), but at the same time it is incredibly soft and comfortable to wear.

Our Fabric Notes

The 16oz slubby denim features a more irregular texture, giving the fabric a distinct surface character. While still structured, it softens with wear and develops noticeable visual texture over time.

Our Fit Notes

The 634 is Iron Heart’s classic straight cut, offering a mid rise and an even fit through the leg. It provides more room than the 555 and 666, making it a reliable reference point for those new to the brand.

Who This Is For

Best for those who prefer a traditional straight-leg fit and a balanced, all-around silhouette. Suited for those who appreciate visible fabric character and a more textured fading profile.

Made In Japan

• Designed by Shinichi Haraki, handmade by WORKS INC. in Japan

634 Straight Cut

• Traditional straight cut, inspired by the 1966 Levi’s 501
• Medium Rise
• Straight leg profile with a slight taper from knee to hem
• Wider leg opening to accommodate most types of boots and footwear
• Classic 5-pocket design

16oz Japanese Slubby Selvedge Denim

• 100% cotton
• Loosely woven to create a heavily textured, breathable denim
• Indigo rope-dyed warp/white organic cotton weft
• Right-hand twill weave
• This slub denim will fade with a distinctive grainy characteristic through wear and washing

Hardware & Construction

• 3-button fly
• Iron Heart branded tack button at waistband
• Works Inc branded pocket rivets
• Hidden rivets on rear pockets
• Poly/cotton stitching for increased strength
• Single and double needle chain stitch construction
• Belt loops anchored at three points and sewn into the waistband
• Heavy cotton pocket bags and lined rear pockets

Selvedge ID

• Sideseam, fly, and coin pocket selvedge ID

Leather Patch

• Heavyweight vegetable-tanned steerhide
• Natural finish
• Belt-through design
• Debossed Iron Heart graphic
• Please note: Continued washing (especially at higher temperatures) may cause shrinkage and deformities

Sanforized & One-Washed

• Sanforization is a post-weave mechanical process which removes most potential shrinkage from a fabric before garment construction
• To further reduce the risk of shrinkage, we wash the completed garment in an aggressive industrial washing machine. This process removes virtually all potential shrinkage.
• No further shrinkage is expected when washed according to our care guidelines

Stretch Details

• The waist will stretch out approximately 1" with wear. All other dimensions that are put under pressure will stretch proportionally to the waist

Care Guidelines

• We recommend washing this garment at 30°C with a low (or no) spin cycle. Hang dry, do not tumble dry

Measurement in inches

FAQs

Is this authentic Iron Heart?
Yes. All products sold by Rugged Gentlemen Shoppe are 100% authentic Iron Heart items sourced from Iron Heart Japan.

Why is this sold out elsewhere?
Iron Heart produces limited quantities and popular sizes sell out quickly on the official site and major retailers.

How fast do you ship?
Orders ship from our shop within 24–48 hours (business days).

Can you help with sizing?
Yes, contact us before ordering and we’ll provide real measurements for the exact pair in stock.