Modern track and light-touring bindings have slots designed to fit a thin metal bar that protrudes from the toe of the boot. They come in two main styles, called "SNS Profil" (for Salomon Nordic System II) and "NNN II" (for "New Nordic Norm"). They're about equally popular. Both are slightly narrower than the ski, and differences in performance are minimal. Unfortunately, boots that fit one binding won't fit the other. Choose the boot first, then get the binding that goes with it. If you've inherited old touring skis with three-pin bindings, plan on replacing the bindings with a new boot/binding package.

The only real choice you have in bindings is between step-in (sometimes called "automatic") and manual. Each has its virtues:

Step-in bindings allow you to put on your skis in a single motion. You just point the toe and push the bar on the front of the boot into the binding until it clicks. Sounds easy, but in soft snow, balanced on one foot, you might think otherwise. Exit the binding by simply depressing the prominent button in front of your toe.

Manual bindings require you to bend over and fasten a latch over the top of the boot's toe bar. It's not a difficult maneuver, but it is a little less convenient than the step-in style. Manual bindings offer marginally better ski control than automatic ones, but unless you ski a lot you're unlikely to notice.

Move on to Light-Touring Equipment - Poles

Regional Cross-Country Skiing Guide
Skiing Trips
GORP Skiing and Snowsports
GORP Skiing Forums
GORP Skiing Books