Sennheiser is clearly gunning for number one with its latest noise-canceling headphones. The PXC-450 is a set of full-size closed-back cans that make use of Sennheiser's brand-new NoiseGard 2.0 technology to make mincemeat out of ambient noise. But unlike a certain other brand (ahem, Bose), these will still work when the battery is drained. Another nice touch is a "TalkThrough" button on the right earcup, which lets you hear what's going on around you without removing the headphones. There are also volume and on/off buttons right on the headphones, and the detachable cable is reinforced with Kevlar!