Built for cold-weather layering, the IHSH-430 is Iron Heart’s rugged reinterpretation of the classic work shirt—crafted from their signature 12oz Slubby Heavy Flannel for maximum texture, warmth, and durability.
Woven in Japan using irregular slub yarn cotton, the fabric delivers a distinctly uneven, character-rich surface while maintaining a soft, double-brushed interior for comfort. Designed as an overshirt, this model features a slightly roomier, boxier cut than traditional Iron Heart work shirts—ideal for wearing over tees, thermals, or lightweight knits.
Finished with classic workwear detailing including dual chest pockets with pen holder, reinforced stitching, and a straight hem with split side gussets, the IHSH-430 balances heritage styling with practical versatility.
Features
Size M
12oz Japanese Slubby Heavy Flannel (SHF)
100% cotton, woven with irregular slub yarn for textured finish
Double-brushed interior for softness and insulation
Button front closure (four-hole buttons)
Dual chest pockets with pen slot
Straight hem with split side-seam gussets
Relaxed/overshirt fit for layering
One-washed (minimal shrinkage expected)
Made in Japan
Fit Notes
Built for cold-weather layering, the IHSH-430 is Iron Heart’s rugged reinterpretation of the classic work shirt—crafted from their signature 12oz Slubby Heavy Flannel for maximum texture, warmth, and durability.
Woven in Japan using irregular slub yarn cotton, the fabric delivers a distinctly uneven, character-rich surface while maintaining a soft, double-brushed interior for comfort. Designed as an overshirt, this model features a slightly roomier, boxier cut than traditional Iron Heart work shirts—ideal for wearing over tees, thermals, or lightweight knits.
Finished with classic workwear detailing including dual chest pockets with pen holder, reinforced stitching, and a straight hem with split side gussets, the IHSH-430 balances heritage styling with practical versatility.
Features
Size M
12oz Japanese Slubby Heavy Flannel (SHF)
100% cotton, woven with irregular slub yarn for textured finish
Double-brushed interior for softness and insulation
Button front closure (four-hole buttons)
Dual chest pockets with pen slot
Straight hem with split side-seam gussets
Relaxed/overshirt fit for layering
One-washed (minimal shrinkage expected)
Made in Japan
Fit Notes
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