To a great extent, our ultra heavy flannel (UHF) shirts define Iron Heart: heavy, rugged, but amazingly wearable. This work shirt is an exclusive black 'herringbone check' which weighs in slightly heavier than our standard UHF fabric because of the herringbone weave. Woven with Aspero cotton from the foothills of the Andes mountains. We 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.

• Made in Japan
• Work shirt
• Iron Heart original 13oz ultra-heavyweight black herringbone check cotton flannel
• Aspero cotton
• UHF (ultra heavy flannel)
• Black cat's eye buttons 
• Single brushed on face and double brushed on reverse
• Single and double needle stitch construction
• Yellow bobbin thread and chainstitch run-off
• One-washed, but could shrink up to half a size with continual or very hot washing/tumble drying
• Model Johnny wears Large
• Tj wears size large