Livefree Microslim Thermal Bottom. This fabric is completely new and comfortable material developed with Japanese technology. This is a light weight high-tech fabric that actually creates heat to warm you up and to keep you warm. The fabric absorbs the body moisture while tiny droplets generate heat. Especially degined hollow fibre keep air into prevent warmth from escaping your body. The fabric also anti pilling, anti static, stretchable, maintains shape after repeated washing.