Iron Heart IHSH-301-GRN-WORK Ultra Heavy Flannel Tartan Check Workshirt - Green

As heavyweight flannels go, the Iron Heart Ultra Heavy Flannels are the champs. They get softer with wear and will most likely outlast you and anything else in your closet. The UHFs are made of Aspero cotton - a naturally occurring wild cotton from the foothills of North East Peru. It's actually a tree (yes, a tree!) so it's one of the purest, most organic forms of cotton in the world. It cannot be mass produced and has been prized by the Peruvians for centuries for its softness, fineness, volume and strength.


  • 12oz 100% Aspero cotton
  • Fabric is single brushed on the outside, double brushed on the inside
  • Black buttons with Iron Heart logo and a button at the collar
  • Two buttoned chest pockets
  • Single, double and triple needle stitch construction
  • Orange bobbin thread
  • One-wash, but could shrink up to a half of a size with continual and/or very hot washing/drying

What it's made out of

  • 12oz Ultra heavyweight flannel made with 100% Aspero cotton

Where it's Made

  • Japan


  • Wear often. Wash less often in cold water, hang dry.


  • Slim fit
  • We recommend taking one size up from your normal shirt size a slim fit or sizing up for a roomy fit


Size Chest Length Sleeve Shoulder
M 21.125 27.75 25.375 16.875
L 22 28.5 26.125 17.75
XL 22.75 28.75 26.5 18.75
XXL 23.5 30 27.25 19.25


  • World-wide shipping via (USPS/UPS/FedEx/DHL). You will receive a tracking number via email.
  • Low flat rate shipping. Free shipping over $250 on domestic orders. Please see Shipping, Returns, and Exchanges” under our “INFO” tab on any page for up-to-date shipping rates.
  • Most packages are shipped via USPS or UPS in the lower 48.
  • Orders shipped to an APO/DPO address are shipped via USPS.
  • International orders are shipped primarily through DHL or UPS. Please be aware that the customer is responsible for any local customs or duties placed on the package upon arrival. As we ship worldwide, we have no knowledge of country specific import taxes, so please refer to guidance from your local government.


  • We accept returns for full refunds within seven (7) days of the order delivery date.
  • Store credit for returns will be issued within fourteen (14) days of the order delivery.
  • All Items for return or exchanges must be postmarked within the seven (7) day period after authorization.


  • We carry limited quantities of many items. To ensure an exchange can be fulfilled, contact us at

Please Note!!!

  • Franklin and Poe is not responsible for shipping costs on exchanges or returns.
  • We only accept items for return or exchange if they are in new condition with original tags, unworn and unaltered.
  • All merchandise purchased on sale, grooming products, underwear, and consignment are final.


Related Items

Sign up for our newsletter!

Be the first to find out about what's going on at F&P