This jacket combines nylon and fleece for both comfort and style. The size is 5, which I believe is equivalent to a Japanese LL size. The sleeves, the inside of the hood, and about the back half are fluffy, but the inside is nylon, so it's not fluffy there. - Brand: go slow caravan - Size: 5 - Color: Blue/Black - Material: Nylon/Fleece Thank you for looking.