New and Improved recipe for 2024! Marathon Black Block is a hard and extra durable glide wax with black, lubricant additive for long distance racing. The Marathon Black Block was developed especially for wet and dirty snow. The black, lubricant additive helps reduce friction against dirty snow. Great in warmer conditions, but can be used in in colder weather as well, offering good glide. Can be applied using a waxing iron or a roto wool brush. Marathon waxes can be used as a stand alone race wax or as a base for liquids or wool-applied top coats.