COMPATIBILITY: Bose Quiet Comfort 20, SENNHEISER IE 300, IE 40 PRO, IE 400 PRO, SOUNDMAGIC E10, and more, provide comfortable, and secure in-ear fit; Doesn't interfere with charging; and offer a superior sound experience ULTRA COMFY: Custom fit for all-day comfort; Work all day, play all night with body-heat activated, super soft memory foam that adapts and molds to your ear for a completely customized fit and hours of comfortable listening STAYS IN PLACE: Secure fit and no more lost earbuds; Engineered to be the perfect length and shape for optimal in-ear fit, these tips stay securely in your ear, whether you’re pounding the pavement or grooving to the music BIG VIBRANT SOUND: Superior sound; Block exterior noise and enhance your base, creating an exceptional audio experience whether you’re concentrating on a call or cranking the tunes CARE INSTRUCTIONS: To keep your tips in top shape, clean them gently with warm water and a soft cloth. Avoid alcohol-based cleaners or lotions, as they can degrade the material.