To a great extent, the ultra heavy flannel (UHF) shirts define Iron Heart: heavy, rugged, but amazingly wearable. This work shirt is an exclusive navy 'crazy check' 12oz fabric, 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.

• Work shirt
• 12oz Aspero Cotton
• UHF (ultra heavy flannel)
• Iron Heart original 12oz ultra heavyweight crazy check cotton flannel in navy/black
• Single brushed on face and double brushed on reverse
• Single an double needle stitch construction
• Yellow bobbin thread with chainstitch run-off
• One-washed - potential to shrink half a size with continual or very hot washing/tumble drying
• Model Shane is wearing a size X-Large, is 180 cm tall and weighs 80 kg
• Made in Japan