Monoprice's Noise Canceling Headphones are about 70 percent as good as the Bose QC15s for a little more than a third of the price.
While they may not be quite as comfortable as Bose's ultrapopular QC 15 headphones, the Harman Kardon NCs offer slightly better sound and have a built-in rechargeable battery to power the active noise-cancellation circuitry.
While it isn't quite as good as the Beats Studio wireless, Sony's MDR-ZX770BN costs significantly less.
CNET explains the tech behind noise-cancelling headphones, which electronically eliminate the sounds of your surroundings.
The $300 NC1 offers excellent sound and comfort in a lightweight design that delivers effective noise-cancellation.
Bose filed suit against Beats in July, accusing the rival headphone and speaker maker of infringing five patents related to noise-canceling headphones.
With the freshly redesigned QC25 ($299.95), Bose has not only enhanced the sound and noise reduction of its flagship NC headpone, but made other small design improvements.
Bose says Beats' Studio and Studio Wireless headphones, soon to be owned by Apple, copy five of its patents.
They're refurbished, but also backed by a one-year warranty. You'd pay at least $100 for them elsewhere.
Despite some downsides, including a high price tag, the Bose QuietComfort 20 offers the best noise-cancelling in an in-ear headphone.