A new wax in Swix 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. It is a good wax for base prep and training, for racing the recommendation is to go with fluoro wax in this temperature area. Recommended iron temp: 120°C (248°F). 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.