Super thick. Pretty rough. Sizing is definately large. I spent an insane amount of time before christmas scouring every amazon review of some nice plaid thick shirts and ended up ordering a few kinds. I would recommend the Woolrich Oxbow Flannel over this shirt. It's much less rough, and the sizing worked better. Neither shirt has a "slim" style, but this one is just plain big-- long arms, everything.  At least the Woolrich ones fit and they are SO soft and cozy. This is not. I ordered the Mahogany and the colors are pretty bland and generic. Not exactly what I was hoping for.