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The most effective fish catching zone in the majority of lakes is within the top 6 feet of the water column. Rio's Sub-surface lake series fly lines are deadly effective on windy days and when fishing in shallow bays, close to lake shores and over the top of weed beds. Each line is built with a supple coldwater core and coating and features a welded loop in the front for fast rigging.
| Line Size | Color | Head Weight | Head Length | Sink Rate | Total Length |
| WF3I | Clear Camo | 125 | 34ft 10.3m | 1.5 to 2.0 ips | 80ft 24.4m |
| WF4I | Clear Camo | 160 | 38ft 11.5m | 1.5 to 2.0 ips | 90ft 27.4m |
| WF5I | Clear Camo | 190 | 40ft 12.2m | 1.5 to 2.0 ips | 90ft 27.4m |
| WF6I | Clear Camo | 220 | 40ft 12.2m | 1.5 to 2.0 ips | 100ft 30.5m |
| WF7I | Clear Camo | 270 | 44ft 13.4m | 1.5 to 2.0 ips | 100ft 30.5m |
| WF8I | Clear Camo | 300 | 44ft 13.4m | 1.5 to 2.0 ips | 100ft 30.5m |
Collections: Freshwater Lines, Rio Fly Lines