When choosing a wax for hot waxing alpine skis, the waxes are color-coded by the temperature of the snow. Because you are unlikely to know the temperature of the snow when applying wax at home, it is best to look at the expected temperatures of the resort and err on the side of cold. Applying too warm a wax for the conditions will make your skis feel like sandpaper.
Yellow is a warm temperature wax for snow temperatures between 0 degrees Celsius and minus-4 degrees Celsius (32 degrees Fahrenheit and 25 degrees Fahrenheit). Yellow waxes are ideal for spring skiing on velvet corn snow, and skiing in wet, heavy snow, because they help to push the melt layer of water out of the way and leave a thin layer of water for the ski to glide on.
Red wax is for snow temperatures of minus-4 degrees Celsius to minus-10 degrees Celsius (25 degrees Fahrenheit and 18 degrees Fahrenheit). Red wax is a good utility wax for most conditions skiers will encounter in the United States.
Blue wax is for temperatures between minus-10 degrees Celsius and minus-25 degrees Celsius (18 degrees Fahrenheit and minus-22 degrees Fahrenheit). If you are not waxing your skis very often and ski in places such as Wyoming, Montana, New Hampshire, Maine and northern New York, blue wax is best to apply because temperatures that are colder than the snow will not affect you as much as applying waxes for snow temperatures warmer than you are skiing on.
Moly Race Wax
Moly Race Wax is designed for artificial snow, or older snow, that racers typically ski on, and for temperatures between minus-10 degrees Celsius and minus-4 degrees Celsisus (14 degrees Fahrenheit and 25 degrees Fahrenheit).