Temperature range from 0°C to 10°C. Recommended iron temp: 120°C. Our test result shows that a slightly harder HF10X performs better in this area compared to the old classic, especially noticeable when used alone. The adjusted hardness is also making the wax more durable than before. HF10X can be used as a race wax alone, but is often used as a base for Cera F powder, such as FC10X.