These are YONEX HEAT CAPSULE GLOVES. They are specially designed to warm your hands, making them perfect sports gloves for the cold season. From the description: These gloves are made of a warm, gentle-to-the-touch, and resilient, fluffy material. They are equipped with the "Heat Capsule" charging system, which uses special processing to convert infrared rays emitted by the human body and the sun into heat. This achieves a warmth of +3°C inside the clothing compared to conventional cold-weather materials. I prepared these gloves because I felt I needed them at work, but I've been using my old, familiar ones, so these have been stored unused. Since I no longer have a need for them after leaving my job, I hope someone who needs them will find them useful. - Brand: YONEX - Product Name: HEAT CAPSULE GLOVES - Size: S - Temperature Increase: +3°C Thank you for looking.