The new Cera Nova CH10X's temperature range from 0degC to 10degC (32degF to 50degF). Recommended iron temp: 120degC (248degF). A new wax for the Cera Nova X line made a slightly harder than the old CH10 Test results show that a harder wax performs better in very wet saturated snow. The adjusted hardness makes it more durable than before. Good wax for base prep and training. For racing we recommend to go with fluoro wax in this temperature area. The speed of the iron should be approx. 8-10 sec. on a skating or alpine ski. The wax can be re-heated after cooling to room temperature (10 min) for better durability. Important to have a good iron to get an efficient melting of the wax.