To a great extent, the 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. This shirt is a wardrobe staple - a work cut in red crazy check.

• Made in Japan
• Work shirt 
• 12oz Japanese ultra-heavyweight flannel - Red crazy check
• 100% Aspero cotton
• Cheese dyed (direct dye) 
• Fabric single brushed on face and double brushed on reverse
• Tonal black stitching
• Black cat's eye buttons
• Classic patch pockets with button fastenings and pen holder
• Single and double needle stitch construction
• Straight back yoke
• Felled internal seams
• Side seam gussets with chainstitch run-off
• Gold bobbin thread
• One-washed, but could shrink up to half a size with continual or very hot washing/tumble drying