I believe this is a Patagonia Synchilla, but it doesn't have a tag on the back of the neck. There is a tag on the inside of the pocket, so it is definitely authentic. I bought it at a used clothing store a long time ago and haven't worn it much. There are no large pills, and the cuffs and hem piping are in good condition. It's very warm, even over a dress shirt. The size is Patagonia M, which is equivalent to a Japanese size L. Please refer to the actual measurements. Length: 67cm, Width: 54cm, Shoulder Width: 52cm, Sleeve Length: 60cm There are some light stains near the right sleeve and the lower abdomen, but they are not noticeable from a distance due to the pattern. Please understand. Stored in a dark closet, non-smoking environment. Instant purchase is OK. I am also selling other Patagonia and North Face items. Thank you.