To a great extent, our 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. 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.

Designed as an overshirt, this cut is an ideal winter layering piece, worn either as an outer or mid layer. Like our traditional work shirt, the cut includes classic patch chest pockets (complete with a pen holder) and button fastenings throughout. Where it differs is in its looser fit, straight hem, and split side-seam gussets, which are more characteristic of our mechanic shirt cut. Wear true to size for layering or a casual relaxed fit, or size down for a more fitted silhouette.