This is from the 2024 Samansa Mos2 Happy Bag. It's made of lightly brushed fabric, so you can wear it in all seasons except for the peak of summer. There is no lining, but it's not see-through. The length can be adjusted with the shoulder straps. It was too cute for me, so I haven't worn it and have kept it at home. It's unused, but please be aware of this.