Bose 40394 QuietComfort 3 Ear Cushion Kit

The Bose QuietComfort 3 Ear Cushion Kit (model 40394) is an official replacement accessory designed to restore worn-out ear pads on QC3 headphones. Over time, the ear cushions on any headphone flatten, crack, or lose their shape, which directly impacts both comfort and the acoustic seal that Bose's noise cancellation technology relies on. This kit provides a fresh pair of cushions manufactured to Bose's original specifications, ensuring the fit, feel, and sound performance match what the headphones delivered when new.

Installation is straightforward thanks to the snap-in attachment design—no adhesive, tools, or technical expertise required. Users simply peel away the old cushions and press the new ones into place on each ear cup. Once installed, the cushions restore the snug, comfortable seal around the ear that is critical for the QC3's passive noise isolation and active noise cancellation to function at full effectiveness. For QC3 owners looking to extend the life of their headphones rather than invest in a newer model, this cushion kit offers a practical and cost-effective refresh.