To a great extent, this 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. It is double brushed on the inside and single brushed on the outside. Resulting in a very soft yet substantial, thick, warm and windproof flannel. This shirt is wardrobe staple - a work cut in red/black buffalo check.

• 12oz Japanese ultra-heavyweight flannel
• 100% Aspero cotton
• Reactive dyed warp and weft - no colour loss to be expected
• Fabric single brushed on face and double brushed on reverse
• Black tonal stitching
• 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
• Orange bobbin thread
• Made in Japan