Sherpa-lined with corduroy-outer jacket. Tortoise shell buttons. The arms are NOT sherpa-lined, but still lined with materials that are only breathable, but also super soft so your long-sleeved shirt or sweater can just glide right in when you wear it. Super warm, casual yet stylish and just the most comfortable jacket. I sadly also rarely reach for this because where I live doesn't get as cold as what this jacket could protect you from. The most interesting thing about this jacket is that the sherpa-lined collar is detachable, leaving you with just the corduroy collar (see pictures). Depending on the style, you can go with your sherpa-lined collar or just go casual without. This style is not available anymore at Sezane (this is part of their winter collection) but the style is exactly the same as the Will Jacket that is currently on their website: https://www.sezane.com/us-en/product/will-jacket/ecru#size-XL Description from the website: - Oversized Jacket - Classic collar - Large pockets on the sides - Button fastening