※There is an explanation about the price change below. If you read it, you will understand. Thank you very much. The Hot Ring M, which can maintain temperature for approximately 60-90 minutes, maintains a temperature of 50°C or higher simply by bending the metal inside, making it ideal for preventing cold. Comes with a fluffy cover. - Product Name: Hot Ring M - Usage Time: Approx. 60-90 minutes - Temperature Maintenance: Usable at 50°C or higher - Quantity: Set of 2 Reusable neck warmer Hot Ring M size Neck circumference 33cm Set of 2 Warmth lasts 60-90 minutes. It says that after use, you can reuse it by placing it in hot water (80°C or higher) for 10 minutes. I think it's fine to put it in a pot you're discarding. It seems ideal for those working in the cold in fields, those in snowy regions, those shoveling snow, or those camping and enjoying a bonfire, as long as there is hot water. I'm writing this because I want to be clear, even though I might not have to. No batteries or charging required. I purchased this for use this season and kept it in storage at home, but due to sequelae from a traffic accident, I cannot use it... It is new and unused, but the packaging has some minor scuffs. The contents have not been used or opened. How about this for working in the cold or warming your neck? Sold as a set of 2, no individual sales, please. *If you would like 2 items, unopened, sent in a box, the price will be 1300 yen. The packaging will not be opened. (The packaging, the blister pack, is quite large, so we will put it in a box.) *If you do not need the packaging and are okay with it being put in a plastic bag, the price for 2 will be 890 yen. This price is due to the thickness of the packaging. The instruction manual will also be neatly folded and included. Please feel free to comment. Neck warmer Hot Ring Reusable Eco-friendly product Set of 2 Neck warmer Neck warming product