Polar Fusion Audio Dots: Instant Hat or Helmet Stereo Headphone Speakers. Comfortable, Flat, and Slimline Speakers. Easy Stick-on, Bulk-free Hook & Loop Fasteners Instantly add stereo headphone speakers to a hat, cap, helmet, or beanie, including 180s ear warmers. Comfortable, flat, slimline design keeps pressure off ears for extended all day wear. Easy stick-on, bulk-free hook & loop fasteners offer custom, adjustable speaker placement. Convenient cord keeper helps keep cord out of the way. High quality stereo headphone speakers deliver superior sound and powerful bass via Neodymium magnets.