Grivel Stealth Helmet Millet Helmet Holder

This is the Grivel Stealth helmet.
I purchased it to climb Mt. Oku-Hotakadake in 2025. (Worn when attacking Mt. Oku-Hotakadake from Karasawa Cirque.)
I used it only once and haven't used it since.
(It was worn over a cap. The straps that directly touch the skin were also disinfected after use.)
I'm selling it because the size didn't fit.
I'm also including a Millet helmet holder that I bought along with the helmet. (This was also used only once.)
There is a small scratch on the back of the helmet. (See the second photo.)
There are no other noticeable scratches.
It is perfectly fine to wear and is generally in good condition.
This helmet has only experienced Mt. Oku-Hotakadake so far, but I would be happy if it could experience the views from various other mountain peaks.
Thank you for your consideration.

[Information quoted from product details/purchase source]
Hyperlight, hyper-ventilation.
Simple rear fitting system for easy handling.
20mm thick polystyrene padding for shock absorption.
Japan Fit standard product.
● Material: Shell: Polycarbonate, Liner: Polystyrene foam
● Size: Head circumference 55-61cm
● Weight: 200g