Very warm because it is black fleece lined. A great addition to your fall/winter wardrobe. Brand: Orvis Pattern: black and white buffalo check Type: shirt jacket, works best as light to medium layer Size: M(10-12) Measurements: width from armpit to armpit approx 20.5in / chest approx 41in. Length from Shoulder to hem approx 23in Materials: face 100% cotton, back 100% polyester