Fly Line Dressing improves and restores the slickness of new or used fly lines. It also reduces friction and improves glide through any sized guide with ease and provides the fly-fisher with a much more accurate cast. Of course, since its a High N Dry product, it is 100% environmentally friendly and contains no harmful VOCs (Volatile Organic Compounds). It is also specifically designed to be used streamside as needed and is not affected by temperature extremes. 30 gram bottle.