Skis with metal edges skis tend to be shorter and more rugged, while edge-less skis are longer, lighter, and work well on trails and groomed tracks, too.
Camber describes how the ski is shaped or bends up and away from the snow from tip to tail. Most Nordic touring skis have a traditional camber that flattens when it's weighted and bows up when it's unweighted; it's therefore important to choose a ski appropriate to your height, weight, and ability. Skis designed for deep snow may have a rockered tip.
Wider skis offer stability and float in deep snow, while a narrower ski will offer less resistance as you're breaking trail through the woods. If you're planning on taking the touring ski on groomed tracks as well, look for a ski that measures no more than 68mm at its widest point.
Like all cross-country skis, the bases of Nordic touring skis are either no-wax or waxable. Some prefer the versatility and convenience of skis with a 'fish scale' base that grips without the need for wax. Others prefer the speed and performance of waxable skis; however, they do require that you choose a wax that precisely matches snow conditions and temperatures.