Optiwax`s answer to the fluoro-free market is their top of the line HydrOX racing wax series! The HydrOX Race Block Cold is designed for aggressive, cold temperature racing conditions, (-8°C to -20°C). These blocks work great as a top coat for better top speed, acceleration, and dirt repellence. In the fluoro-free world, best performance will be achieved by testing different application/polishing methods and with use of structure tools. Try these blocks by buffing with a cork, wool, or fleece. Optiwax recommends using blocks by applying a thin layer on the ski base prior to applying their HydrOX glide tape for great results, especially in when humid.