"Very thick, hefty, well built. Excited to break it in!"
Free shipping
We offer FREE economy shipping on all contiguous U.S. orders $99+. Please read our returns policy on our FAQ page for more details. All sale items are final.
Free exchanges
Exchanges are free on all contiguous U.S. orders. Start one from your order confirmation email, or read the full policy on our FAQ page. All sale items are final.
Size Recommender
Built to be lived in, the Slab Shirt carries the tradition of West Coast work ethic and laid-back grit. It’s the kind of flannel that’s seen morning fog roll off the Pacific, been tossed over a hoodie when the winds shift offshore, and draped over a passenger seat still sandy from the day before. This shirt is less of a garment and more of a uniform - for those who keep it local, keep it simple, and keep showing up.
THE SPECS + DETAILS
- 11.5oz 100% heavyweight yarn dyed cotton twill
- Custom INR metal buttons
- Single chest pocket with top entry flap
- Locker loop draw cord on inside collar
- Available in black and brown
- Imported
HOW IT FITS
The Slab Shirt runs true-to-size; however, if you tend to be between sizes or prefer a roomier fit, we would recommend ordering a size up.
Our goods are meant to be worn in, not out. With the correct care, we want our customers to be able to treat their gear with the tough love it was intended to take. Take a look at our Wash & Care Guide to keep your goods performing for a lifetime.
Good things never go out of style. And great things get better with the passage of time.
Quality Built Provisions
Our brand mission is to create purposeful and quality-built provisions and make them last a really long time.
FAQ's
Every product page has a Size Guide link next to the size selector with garment measurements. Most of our shirts and jackets run true to size with a modern tailored cut — if you're between sizes, size up.
Free economy shipping on all contiguous U.S. orders over $150. Economy takes 5–7 business days, expedited 2–3. Orders placed before 12pm PT ship the same business day.
30-day free exchanges on all domestic online orders. Returns are accepted within 30 days on unworn items with tags attached. All sale items are final.
Yes. International shipping is calculated at checkout and duties are collected up front so nothing is owed on delivery.
Most of it. Our Repair & Replace programme will patch, restitch or re-snap anything we made — send it in and we'll quote the work before we start.
Overall rating: 5.0 / 5 from 16 reviews.
AI Generated Review Summary
Summary topics
Review topics: [flannel, shirt].
Review highlights
Reviews
Fantastic
"Love hefty flannels and this does not disappoint! The shirt fit and style is just the way I prefer. The quality is undeniable!"
Amazing shirt, great quality.
"Amazing shirt, great quality."
👍😁
"Another fantastic quality product. As with the other IR flannels I already own, super happy with purchase. Gen X so I remember when most things were manufactured to last, now referred to as “heritage” with quality footwear for example. IR flannels are heritage standard!"
Slab short
"What a great shirt. It’s heavy and stiff, feels like armour. It will stand on a table like someone is wearing it. Wash it, wear it, break it in."
Slab Shirt
"The shirt looks even better in person!"
Heavy Duty Flannel
"It seems like a good-looking shirt with a sturdy, lived-in vibe rather than anything fussy."
Eye rolling excellence
"the Slab flannel shirt. . . handsome, heavy and ridiculously well made. I got the brown, kind of wish i'd gotten the black as well. Typically whatever you buy from I & R will make you very happy. 🔥⚡️💥"
Great Shirt!
"Love the pattern, material is rugged and feels high-quality! Sizing is a little on the smaller size."
Best Flannel I’v ever purchased!
"I have finally found the best flannel ever. I am a “good flannel” lover, and I have to say, this one from Iron & Resin is it. It’s nice and thick, built strong and the cut and fit make it look great. I literally just purchased another one identically like it just to have in my closet years down the road after the first wears out. If you decide to purchase it, and you’re a flannel lover like me, you wont be disappointed. Unless you’re a lame-ass who has no appreciation for real great mens clothing that is made to last the test of time and is always classic. Don't be a wuss, go get yourself one. Matt"
Q&A
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We Make Quality Provisions That Last
Forged in Ventura, CA in a mass produced, disposable world, Iron & Resin is a product of "one-off" culture. Where men still build, by their own hands, the craft they ride, be it water or land.
