Iron Heart 12oz Ultra Heavy Flannel Work Overshirt – Camel Overdyed / IHSH-452

Few fabrics capture the spirit of Iron Heart quite like its legendary Ultra Heavy Flannel. For Fall/Winter 2026, the Japanese brand takes this signature material in a new direction with the IHSH-452-CAM, its first-ever solid-colored, overdyed UHF overshirt. Finished in a rich, golden camel shade, it combines the rugged character of traditional workwear with an exceptionally soft feel and a clean, understated appearance.

At the heart of this overshirt is 12oz Japanese Ultra Heavy Flannel, woven from 100% Aspero cotton, a rare wild cotton native to the Andean foothills of northeastern Peru. Valued for its natural strength, softness, and volume, Aspero gives the fabric its distinctive substance without sacrificing comfort. The tightly woven twill is double brushed on the inside and single brushed on the outside, creating a remarkably soft, insulating surface while maintaining the density and wind resistance that make Iron Heart's heavyweight flannels so exceptional.

What sets this version apart is its unique overdyeing process. Rather than simply dyeing the finished garment, Iron Heart begins with yarn-dyed flannel and then overdyes the completed shirt in the same camel shade. This additional treatment intensifies the color, creates a beautifully uniform appearance, and further softens the already substantial fabric. The result is a distinctive combination of rich color, tactile depth, and the unmistakable weight of a genuine Iron Heart UHF.

Designed with cold-weather layering in mind, the relaxed, oversized workwear silhouette offers plenty of room for a sweatshirt or sweater underneath. A straight hem, split side-seam gussets, and two buttoned chest pockets with an integrated pen holder give the overshirt its functional character. Handmade in Japan by WORKS Inc., it is equally suited to being worn as a substantial shirt, a warm mid-layer, or a lightweight outer jacket.

• Iron Heart Ultra Heavy Flannel Work Overshirt
  
• IHSH-452-CAM
  
• Overdyed Camel
  
• Relaxed Fit
  
• 100% Aspero Cotton
  
• 12oz Japanese Ultra Heavy Flannel
  
• Reactive-Dyed Warp & Weft
  
• Additionally Garment Overdyed
  
• Single- & Double-Brushed
  
• Soft, Dense & Wind-Resistant Fabric
  
• 2 Buttoned Chest Pockets with Pen Holder
  
• Four-Hole Contrast Buttons
  
• Straight Hem with Split Side-Seam Gussets
  
• One Wash: Minimal Shrinkage
  
• Made In Japan

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