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To a great extent, Iron Heart's ultra heavy flannel (UHF) shirts define Iron Heart: heavy, rugged, but amazingly wearable. The 12oz fabric is woven with Aspero cotton from the foothills of the Andes mountains. They double brush it on the inside and single brush it on the outside, resulting in a very soft yet substantial, thick, warm and windproof flannel.

New for FW26, this overshirt represents a first for Iron Heart: an overdyed UHF in a solid colourway. To achieve this rich camel-brown shade, the shirt is first made using a regular yarn-dyed UHF fabric before being overdyed in the same colour after construction. This process deepens and intensifies the hue, softening the fabric further while retaining the signature UHF heft.

Designed as an overshirt, this cut is an ideal winter layering piece, worn either as an outer or mid layer. Like their traditional work shirt, the cut includes classic patch chest pockets (complete with a pen holder) and button fastenings throughout. Where it differs is in its looser fit, straight hem, and split side-seam gussets, which are more characteristic of their mechanic shirt cut. Wear true to size for layering or a casual, relaxed fit, or size down for a more fitted silhouette. 


  • Made in Japan
  • Oversized work shirt
  • 12oz Japanese ultra-heavyweight flannel
  • 100% Aspero cotton
  • Reactive dyed warp & weft - no colour loss expected
  • Fabric is single-brushed on the face and double-brushed on the reverse
  • Tonal poly/cotton stitching and bar tacks
  • Four-hole buttons (which can be upgraded with 13mm or 15mm GOOD ART HLYWD buttons)
  • Classic patch pockets with button fastenings and a pen holder
  • Straight back yoke
  • Straight hem with side seam slits
  • Felled internal seams
  • Single and double needle stitch construction
  • Tonal bobbin thread
  • One-washed, but could shrink up to half a size with continual or very hot washing/tumble drying


Size

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