This is a mesh jacket with a liner from RS TAICHI. The product number is RSJ302. I purchased it in 2016 at Naps in Tokyo for around 29,000 yen and wore it about once a month during the warm months of June to September. However, I am selling it now because I stopped using it after buying a new mesh jacket. The size is M, and it fits just right with a chest protector on, for someone who is 171cm tall and weighs 61kg. It has decent built-in protectors, and there are also hooks to attach a separate RS TAICHI chest protector. It comes with a removable liner, so it can be used during seasons other than summer. There are no noticeable stains or scratches, but please understand that there are some small specks of dust or dirt-like marks.