On Ear Headphones. Like the Koss Porta Pro and SportaPro, the lightweight Koss KPH25 on-ear headphones offer great sound for listeners always on the go. With an over-the-head design and contemporary styling, the Koss KPH25 headphones look as good as they sound. Equipped with dynamic elements for an extended frequency response, the KPH25 headphones fold flat for easy storage and portability, making them ideal for active listeners who enjoy an on-the-go lifestyle and those who travel frequently. Finish: Black