Ariat Men's FR Flannel Insulated Shirt Jacket

Is this a shirt or a jacket?

Both, functionally. It's cut like a flannel shirt with a snap front, so it wears comfortably on its own indoors, but the insulation makes it warm enough to work as your outer layer on cool days — or to go under a heavier coat when it gets cold.

Does it carry a flame-resistant rating?

Yes, it's CAT 3 and certified to NFPA 2112. Confirm the arc rating on the spec table before you order if your site has a specific cal/cm² requirement.