Hmmm, cats (and many other animals) use their facial whiskers to find their way around in dark cramped places. Ocelots, which live in very dense forests, have the longest whiskers of all. So, maybe you could design a swim cap with long nylon whiskers. On the inside of the cap, around the forehead and side, the whiskers would be attached to little plastic tabs that would move and touch the skin a different way when the end of the "whisker" hits something like a lane rope.
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