Get four amazing Koss Porta Pros in this exclusive Amazon Bundle. The acclaimed Koss Porta Pro has set performance and comfort standards for personal listening worldwide. Designed for those with refined musical taste, the Porta Pro continues to be one of the most popular headphones around the world. Known for its high-level of comfort, the Porta Pro has adjustable temporal pads to relieve pressure on the ears. Its lightweight, open-air cushions for hear-through sound keep listeners aware of their surroundings while delivering exceptional sound. Protect your investment with bundled official Porta Pro Hard Carry Case The Porta Pro Hard Case is designed specifically for the world-renowned Koss Porta Pro. It is a perfect case designed for travel. The durable case zips shut completely for safe storage.