Summer is here in the Midwest, and it's been an especially hot week so far. Outdoor sporting activities like biking, hiking and jogging during such weather conditions produce copious quantities of sweat. And on those rare occasions when getting caught in a sudden downpour is a thankful cooling off experience (as long as your electronics are not affected as a result). These are just some of the conditions that Pioneer's SE-CL331 headset was designed to handle.