The French school of nymphing is interesting for fishing with very long rigs. 
This technique is incredibly effective especially in smaller, shallow, clear rivers. CAMOU FRENCH LEADER is made from an attractive monofilament fiber that has almost no shape memory. 
This allows even the smallest flies to be cast.
0.50mm - 0.15mm point
0.55mm - 0.18mm point
0.55mm - 0.21mm point