Arc'teryx Proton Hat [Waterproof Shipping] Thank you for viewing! Arc'teryx Proton Hat Arc'teryx Proton Hat Color: Black Size: S-M I have stored it without using it even once since I bought it. I hope someone will use it since I don't plan to use it in the future. Although it is new and unused, please purchase it as a used item. I purchased it from the official app.