This is the TENTIAL neck pillow, which is a hit product called "Bakune." I bought it at the airport and tried it out when I bought it, but I haven't traveled since then, so I'm selling it. It has a shape-memory alloy inside, which allows it to support your neck in ways that typical neck pillows can't. //tential.jp/products/neck-pillow ↑ Please see the official website for more details.