This item was included in a lucky bag. I didn't know what it was, so I looked it up and it seems to be a knee support. I've included a picture of the current product in the second photo. This product appears to be discontinued. I'm selling it because I won't be using it. The material and size are unknown. If you're okay with that, I'm offering it at a low price. (The current product costs a little over 3000 yen.) It's a product from a store called Maruei Knit. (Made in Japan with peace of mind, produced in-house) Although it's unused, it has been stored at home. Please understand. *Instant purchase is welcome.