THE NORTH FACE Micro Stretch Neck Gaiter with KODENSHI This neck gaiter is made with Thermolite material, which is a blend of high-tech KODENSHI fiber that utilizes far-infrared energy emitted by the body to warm the core, thanks to the action of special ceramics. While the material is highly stretchable, it's designed to maintain a three-dimensional shape for enhanced usability. [Function] Uses highly insulating Thermolite I recently purchased this but it didn't suit me, so I'm selling it. I only tried it on, and I removed the paper tag, but I still have it.