NNN (New Nordic Norm) bindings clamp onto a bar at the front of the boot, and feature two ridges running the length of the binding that correspond to the sole of NNN-compatible boots. NIS bindings have essentially the same design, but are also compatible with skis that have an NIS mounting plate. This allows them to be installed easily and adjusted on the fly.
SNS Profil skate bindings have the same single-bar attachment point as NNN bindings, but the binding plate has a single wider ridge running down the middle that interfaces with a depression on the sole of compatible boots. These bindings work with any SNS boot and can be mounted on any flat ski top.
SNS Pilot bindings differ from other cross-country bindings in that they have two points of contact with the boot. They are therefore only compatible with SNS Pilot boots that have the two bars embedded in the sole. This two-axle design is ideal for skate skiers of any ability, offering a blend of stability, torsional rigidity, and power transmission.