Waterproof Cast Cover - Adult - Forearm - Half Arm

I purchased this urgently because I was concerned about showering with a broken wrist, but I ended up not using it, so I am selling it.
You can find it by searching for waterproof cast cover on Rakuten's website.

This is for adults.
Please note that it is described as half arm, so be aware of the applicable body part.
Also, since it is unused, I do not know how easy it is to use.
Please understand that I will not be able to respond to complaints such as water leakage.