It's a tip that's been around for a long time....I first came across it in one of Bob Izumi's books...he mentioned lukewarm water, not too hot. The idea is to take the memory out of the line, as the diameter of the spool it's packaged on is likely different than that of your reel. Of course it's going to conform to your reel eventually....if the line has sat for some time, you can always pop the spool off and soak it before you head out.