To find the best earmuffs, ear warmers and other types of winter headwear, I spoke with winter apparel experts for their guidance on what to look for.

There's also a new "Inverted-F Antenna," which bumps up the gain from 1.6 dBi to 2.91 dBi and replaces the previously-used chip antenna. The battery on the XM6 will remain the same, offering 3.8V as ...