This is a Helios glass (inner) thermos known for its excellent heat retention. It's a 1L thermos made in Germany, with a simple, sturdy construction and functional design. To prevent hot water from leaking, you need to tighten the lid completely, but the lid is designed to fit in your palm, making it easy to loosen. The internal insulation material is glass. The red label stands out against the jet-black body. As shown in the third photo, there are some melted marks on the body, likely from direct exposure to fire. However, the material is heat-resistant polypropylene, so only the surface is melted, and the inside is completely unaffected. Therefore, it's listed as "defective" and the price reflects this. There are some scratches on the jet-black body that occurred during storage. Those who are concerned about even minor scratches, those who want a perfect item, or those who are overly sensitive should refrain from purchasing. I received this from an acquaintance who is relocating overseas. The heat retention function has been confirmed, and the hot water stays warm for a long time. Please consider purchasing only if you understand the above condition. Please note that we cannot accept claims or returns after the purchase process is complete.