The Ultra-Heavy Duty (UHF) flannel shirts largely define Iron Heart, they are heavy, tough, yet amazingly wearable. This work shirt is an exclusive 12 ounce green tartan check fabric woven from Aspero cotton from the foothills of the Andes. It is double brushed inside and single brushed outside resulting in a very soft yet strong, thick, warm and windproof flannel.

• Work shirt
• Iron Heart original 12oz ultra-heavyweight green tartan 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
• Orange bobbin thread and chainstitch run-off
• One-washed - potential to shrink half a size with continual or very hot washing/tumble drying
• Shane wears Large, is 180 cm tall and weighs 78 kg
• Made in Japan