Philip Kingsley Swimcap Cream
This has a cult following for good reason. Whether you color your hair or not, it can take a beating from chlorine, sea salt, and intense UV rays. But thanks to moisture-magnet glycerin as well as dimethicone, which wraps itself like armor around fragile strands, this combats both the dreaded fade and the frazzled feel. Worth its weight in gold, if you ask us.