Iron Heart IHSH-442 SAX Blu Review — 9oz Selvedge Flannel Check Work Shirt
If you know Iron Heart, you know their Ultra Heavy Flannel shirts — the 12oz and 14oz monsters built for winter. The IHSH-442 SAX takes a different approach. At 9oz, it's Iron Heart's lighter-weight flannel offering, designed as a breathable alternative for warmer months without sacrificing the craftsmanship and Japanese manufacturing the brand is known for.
Currently sold out in every size. Visit the product page and tap Notify Me to get an alert the moment it's back in stock.
The sax blue colourway is no accident. It's a direct nod to Iron Heart's sought-after 20th anniversary UHF from 2022 — a classic sax blue check that proved so popular it became the blueprint for this season's 9oz version. If you missed the anniversary shirt, this is your second chance in a more versatile weight.
Fabric
The IHSH-442 is made from 9oz Japanese selvedge flannel — 100% cotton, woven at one of Japan's specialist mills on one of only 4 remaining mills capable of producing these intricate check patterns by switching the weft yarn mid-weave.
Key fabric details:
- 100% cotton
- Unbrushed heel weave
- Reactive-dyed warp and weft yarns — no fading to be expected
- Placket, cuffs, and gusset in selvedge ID
Care: Wash at 30°C with a low or no spin cycle. Hang dry, do not tumble dry.
Cut & Construction
The IHSH-442 follows Iron Heart's standard work shirt cut — regular fit, not boxy but with enough room to layer over a tee comfortably.
Construction details:
- Work shirt pattern
- Regular fit
- Button fastenings (4-hole)
- Chest pockets with pen holder
- Bar tack pocket reinforcements
- Straight back yoke
- Rounded hem with gussets and chainstitch run-off
- Single and double needle stitching
- Bar-tack thread for enhanced strength
- Chainstitch side seams
- Felted internal seams
The construction spec is full Iron Heart — chainstitch throughout, felted internal seams, bar-tack reinforcements at stress points. This is not a fashion flannel. It's built to the same standard as their heavyweight pieces.
Designed by Shinichi Haraki. Handmade by WORKS INC. in Japan.