Swix CH3 Cold Powder is a special synthetic hydrocarbon powder wax to add to other waxes for increased durability in icy and very cold conditions. For especially abrasive snow, such as newly man-made snow.
To apply melt the wax of your choice on the ski and then sprinkle CH3 over the wax while still warm. Iron the CH3 powder into the wax layer. Even a generous amount will not effect glide. Allow to cool, then scrape and brush away excess.