ATM Soundpodz are designed to simply fit over regular in-ear headphones, instantly improving the sound quality by feeding the music directly into the ear. Each six pack of ATM Soundpodz features three different sizes of anatomically designed Podz to ensure a comfortable fit for nearly every ear. By slipping them over your regular earphones, ATM Soundpodz keep them securely in place, while the unique acoustic chamber design offers a significant improvement in bass and mid frequencies.