I received this as a gift, but I have no use for it, so I'm putting it up for sale. It's lightweight and breathable, making it convenient for everyday use and running. It's new and unused, and the size is 26cm. I hope someone will find it useful. *Please note that due to personal storage, there may be scratches, dents, or slight tears on the outer box. Thank you for your understanding. The item will be shipped in simple packaging. Please purchase only if you are comfortable with this.