Practice level: Cross-country ski boots are generally classified into three categories according to their performance level: beginner, intermediate and expert. Beginner boots offer more comfort and warmth, while expert boots are stiffer and perform better.
Type of use: Depending on your preferred cross-country skiing discipline, there are two types of boot: classic and skating. Classic boots are designed with a flexible sole and offer little ankle support to facilitate the rolling of the foot. Generally with a low shaft, they are flexible for maximum ease and comfort.
Foot morphology: It's important to choose boots that suit your morphology, in terms of width and volume. Cross-country boots are generally narrower than alpine boots, but wider models are available for wider feet.
Binding system: Cross-country ski boots are equipped with a binding system that connects to the skis. There are two types of binding system: SNS (Salomon Nordic System) and NNN (New Nordic Norm). It's important to check that the bindings on your boots match those on your skis, or are compatible with each other.
To choose the right size for your cross-country ski boots, opt for your usual size and choose boots in which you feel comfortable. Avoid boots that are too small, which can cause chafing, and boots that are too big, which can reduce the transfer of information from the boot to the ski. Bear in mind that the liner will settle over time, which is an important consideration when buying cross-country ski boots.