Not very insulating, the arms on the inside are not the same as the lining..
Was not very warm, or water resistant like a waxed shirt would be..
But it never said it was in the description, so I am happy, looks great..
I live about a mile up the side of a mountain and wear it every morning before the sun comes up..
I sprayed it with Camp dry silicone spray for tents and it now sheds water and is still breathable. But the lining will adsorb water if it runs down your neck so wear a hat with a wide brim  in the rain..