Where fly line is concerned there's a huge difference between 'cold' and 'really cold'; the Airflo Stripper will behave very differently (in a good way) in near-freezing water. This sinking Cold Saltwater Striper fly line has a serious sink rate of 7ips.
When getting down and staying down is the key to success, this 7" per second sinker with its full sinking profile allows flies to stay at depth for longer. Excellent in cold water conditions, lack of tangles, carries large flies well.