Aside from our heavyweight denim, the Ultra Heavy Flannel (UHF) is truly a signature Iron Heart fabric—heavyweight and rugged, yet incredibly soft and comfortable.

Woven with Aspero cotton farmed from the foothills of the Andes Mountains, this 12oz fabric is brushed on the face and double-brushed on the reverse, resulting in one of the most substantial flannels you’ll find—offering excellent warmth and windproofing.

Unlike our rope-dyed and sulphur-dyed fabrics, this flannel features direct-dyed yarns, ensuring steadfast colour within the vibrant check patterns.