Vacuum dressed lines are braided solid and the waterproofing material is applied in a vacuum chamber from
which the air is exhausted by a powerful rotary pump. This enables the dressing to saturate thoroughly every fibre of the silk so that it becomes a part of the line itself and not merely a coating on the surface. After being treated in this manner several times the lines are cured and then carefully polished by hand so that they have a full roundness with a finish that will not chip or become sticky. These lines are very heavy, soft and flexible with little tendency to kink and are the last word in elegant fly fishing lines. They may be had either level or single or double tapered. The usual color is brown.
