The basics Thread Magic Ultimate Thread Conditioner is designed to reduce friction and make thread more manageable when sewing.  The benefits Safe for all threads & fabrics and is ideal for metallic and specialty threads.  The uses Prevents tangling, fraying and knotting while strengthening the thread and protects against UV rays, mold and mildew.  The bottom line Does not melt or freeze, and leaves no residue. Tested & guaranteed safe for the environment.