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There are three common Nordic binding systems:
* The ''NNN'' (New Nordic Norm), where a bar in the toe of the shoe is hooked into a catch in the binding. Also exists in the more rugged ''BC'' (Back Country) variant. Two small ridges run along the binding, corresponding with slits in the boot. There have been several versions of NNN, with the latest incarnation known as the Nordic Integrated System ('''NIS'''), unveiled by [[Rossignol]], [[Madshus]], [[Rottefella]], and [[Alpina Žiri|Alpina]] in January 2005;<ref>http://www.nordicskiracer.com/Equipment/2005/NIS/NIS.asp</ref> in 2007, [[Fischer]] abandoned SNS and switched to NIS. First NNN versions are not compatible with current NIS designs.
[[Image:Fijación fondo.jpg|thumb|right|250px|SNS binding]]
[[Image:Old-sns-bottom.jpg|thumb|right|250px|Obsolete SNS binding on the shoe]]
[[Image:New-sns-bottom.jpg|thumb|right|250px|Newer SNS binding on the shoe]]
* ''SNS '' (Salomon Nordic System; marketed by [[Salomon Group|Salomon]]) looks very similar to NNN binding, except it has one large ridge and the bar is narrower. Three variants exist: ''Profil'', the standard model; ''Pilot'', specific for either skate-style or classic-style cross-country skiing, and the "X-Adventure" variant for backcountry skiing. While Pilot skate boots can be used with a normal Profil binding, Profil boots cannot be used with Pilot skate setups. Because of its ease of use it is quite common, though in some places NNN equipment (broadly comparable in terms of cost and performance) is easier to come by and hence used more. Previous SNS systems exist with a loop protruding from the front of the boot rather than a bar flush with the front, and these are obsolete and no longer available. Current providers of SNS boots and bindings include
*75 mm (''Rottefella'', ''Nordic Norm'', 3-pin) This is the original, classic system found on cross country skis, invented by [[Bror With]]. These bindings, once the standard, are no longer as popular as they were but still hold a significant share of the market for mid-weight touring setups with relatively heavy boots, as typically used for hut-to-hut touring in Norway. In this system the binding has three small pins that stick up. The toe of the boot has three holes that line up with the pins. The boot is then clamped down by a bail. Despite the decreasing use of the 3 pin "rat trap" ("rottefella" in Norwegian) binding in lighter cross country, the characteristic "duckbill" toe it uses is still assumed in the design of heavier cable bindings, and 75 mm boots are still widely available, especially for telemark technique and more rugged touring. A similar system with a 50 mm "duckbill" once existed for lighter setups, but is obsolete and no longer available. Characteristically, the 75 mm wide binding is chiral, having left and right foot orientations, which the 50 mm and other bindings don't distinguish. The 50 mm was the binding of choice for racing, prior to the adoption of skate ski racing, in the early 1970s. The 50 mm was also designated according to the thickness of the "duckbill" having either 7 mm or 11–13 mm thick soles hence these bindings often had two notches in the bail to clamp boots with different sole thicknesses. Another 50 mm characteristic, distinct from the 75 mm, and still seen in present day 75 mm boots, was the absence of a cable groove in the heel.
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