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A cross-country ski includes a cross-country ski having a central area for receiving a ski binding device for fixing a ski boot to the ski. The fixing area includes a space for receiving the binding device and a top bearing surface of the ski which is applied to at least one side of the space for re

A cross-country ski includes a cross-country ski having a central area for receiving a ski binding device for fixing a ski boot to the ski. The fixing area includes a space for receiving the binding device and a top bearing surface of the ski which is applied to at least one side of the space for receiving the binding device and on which the boot is directly connectable when the user applies a pressure force.

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1. A cross-country ski system comprising: a cross-country ski comprising an upper surface including a central zone constructed and arranged to receive a device structured and arranged to be connected to a part of a boot in an area corresponding to a metatarsophalangeal bending zone of a wearer's foo

1. A cross-country ski system comprising: a cross-country ski comprising an upper surface including a central zone constructed and arranged to receive a device structured and arranged to be connected to a part of a boot in an area corresponding to a metatarsophalangeal bending zone of a wearer's foot for binding the boot to the ski;the central zone of the ski comprising a binding zone having a location for receiving the binding device;the upper surface of the ski comprising an upper support surface arranged on at least one of two lateral sides of the location to receive the binding device, the upper support surface being exposed laterally of the binding zone for coming in direct contact with the boot when a skier using the cross-country ski system exerts a pressure force with the boot toward the ski;the location for receiving the binding device comprising an upwardly facing binding-receiving open recess of the upper surface of the ski;the upwardly facing open recess of the upper surface of the ski extending downwardly at least partially to a depth below said upper support surface. 2. A cross-country ski system according to claim 1, wherein: in the central zone of the ski, at least one lateral shoulder is arranged on one of the two lateral sides of the location for receiving the binding device such that the boot can be supported directly on the shoulder. 3. A cross-country ski system according to claim 2, wherein: the shoulder comprises a support surface for the boot arranged above the upper surface of the location for receiving the binding device. 4. A cross-country ski system according to claim 1, wherein: the ski comprises two lateral upper surfaces arranged on respective lateral sides of the location for receiving the binding device. 5. A cross-country ski system according to claim 1, wherein: the upper support surface of the ski is longitudinally arranged in the area corresponding to a metatarsophalangeal bending zone of the wearer's foot. 6. A cross-country ski system according to claim 1, wherein: at least in part of the central zone, a transverse width of the upper support surface is greater than a width of a lower gliding surface. 7. A cross-country ski system according to claim 1, wherein: the upper support surface extends to an outer transverse edge of the upper surface of the ski. 8. A cross-country ski system according to claim 1, wherein: the upwardly facing recess of the location for receiving the binding device extends within the area corresponding to the metatarsophalangeal bending zone of the wearer's foot. 9. A cross-country ski system according to claim 1, wherein: the ski has no boot sole-engaging rib projecting from a longitudinal median plane of the ski. 10. A cross-country ski system according to claim 1, wherein: the upwardly facing binding-receiving open recess is structured and arranged to receive a width of the binding device. 11. A cross-country ski system comprising: a cross-country ski comprising a central zone adapted to receive a device for binding a boot to the ski;the central zone of the ski comprising an upper surface including a binding zone having a location for receiving the binding device;the upper surface of the ski comprising an upper support surface arranged on at least one of two lateral sides of the location to receive the binding device, the upper support surface being exposed laterally of the binding zone for coming in direct contact with the boot when a skier using the cross-country ski system exerts a pressure force;the location for receiving the binding device comprising an upwardly facing open recess of the upper surface of the ski;a binding device constructed and arranged to be fixed on the ski in the upwardly facing open recess of the location for receiving the binding device, the binding device including a mechanism for binding engagement with the boot;the upwardly facing open recess of the upper surface of the ski extending downwardly at least partially to a depth below said upper support surface. 12. A cross-country ski system according to claim 11, wherein: the binding device has, at least in the area of the support surface, a lesser width than a width of the ski. 13. A cross-country ski system according to claim 11, wherein: the binding device is adapted to be fitted within the recess of the upper surface of the ski;the binding device has an upwardly projecting rib adapted to be positioned within a downwardly facing longitudinal recess in a sole of the boot;the cross-country ski system includes no baseplate to be mounted upon the ski between the boot and the upper support surface of the ski, so that the upper support surface of the ski is structured and arranged to contact the boot directly when the boot is engaged with the mechanism of the binding device. 14. A cross-country ski system according to claim 13, further comprising: a boot having a support surface adapted to be supported directly by said upper support surface of the ski. 15. A cross-country ski system according to claim 14, wherein: said support surface of the boot is in a metatarsophalangeal bending zone of the boot. 16. A cross-country ski system according to claim 11, wherein: the mechanism for engagement with the boot includes a front jaw adapted to engage a front bar of the boot for enabling articulation of the boot with respect to the ski;the binding device includes an elastic return mechanism, said elastic return mechanism being rearwardly spaced from the front jaw and being adapted to engage a rear bar of the boot for applying an elastic return force to the rear bar. 17. A cross-country ski system according to claim 11, wherein: the binding device is adapted to be affixed to the ski by being positioned within the recess of the upper surface of the ski;the binding device has an upwardly projecting rib adapted to be positioned within a downwardly facing longitudinal recess in a sole of the boot;the cross-country ski system includes no baseplate that would prevent a lower external surface of the boot from direct supporting engagement on the upper support surface of the ski. 18. A cross-country ski system according to claim 11, wherein: the binding zone has a length extending lengthwise of the ski;continuously, at each lengthwise increment along an entirety of the length of the binding zone, the upper surface of the ski has a width greater than a width of the binding device. 19. A cross-country ski system according to claim 18, wherein: with the binding device fixed to the ski in the binding zone, the lateral support surface is exposed for direct engagement of a lower surface of the boot during skiing. 20. A cross-country ski system according to claim 11, wherein: the upper support surface extends to an outer transverse edge of the upper surface of the ski. 21. A cross-country ski system according to claim 11, wherein: the upwardly facing recess of the location for receiving the binding device extends within an area corresponding to a metatarsophalangeal bending zone of the wearer's foot. 22. A cross-country ski system according to claim 11, wherein: the ski has no boot sole-engaging rib projecting from a longitudinal median plane of the ski. 23. A cross-country ski system according to claim 22, wherein: the binding device further comprises a boot sole-engaging rib rearward of an entirety of the mechanism for binding engagement with the boot. 24. A cross-country ski system according to claim 11, wherein: the binding device further comprises a boot sole-engaging rib rearward of an entirety of the mechanism for binding engagement with the boot. 25. A cross-country ski system according to claim 11, wherein: the upwardly facing open recess is structured and arranged to receive a width of the binding device. 26. A cross-country ski system comprising: a cross-country ski and a binding device having a mechanism to engage a boot to bind the boot to the ski;the cross-country ski having a longitudinally extending binding zone spaced from front and rear ends of the ski, said binding zone comprising: a pair of transversely spaced apart longitudinally extending upper support surfaces structured and arranged to support directly support surfaces of a sole of a boot at least in a metatarsophalangeal bending zone of the boot when the boot is engaged with a mechanism of the binding device for engagement with the boot;an upwardly open longitudinally extending binding-receiving recess positioned between said pair of upper support surfaces;at least in the binding zone, the ski has an upper surface width greater than a width of the binding device, thereby exposing the upper support surfaces for direct contact with the sole of the boot on opposite lateral sides of the binding device;the binding device being structured and arranged to be fixed upon the ski in the upwardly open recess of the binding zone, the binding device having an upwardly projecting rib adapted to be positioned within a downwardly facing longitudinally groove in the sole of the boot;the upwardly facing open recess of the upper surface of the ski extending downwardly at least partially to a depth below said upper support surface. 27. A cross-country ski system according to claim 26, wherein: the cross-country ski system includes no baseplate that would prevent a lower external surface of the boot from direct supporting engagement on the upper support surfaces of the ski. 28. A cross-country ski system according to claim 26, wherein: the binding device includes a front jaw adapted to engage a front bar of the boot for enabling articulation of the boot with respect to the ski;the binding device includes an elastic return mechanism, said elastic return mechanism being rearwardly spaced from the front jaw and being adapted to engage a rear bar of the boot for applying an elastic return force to the rear bar. 29. A cross-country ski system according to claim 28, further comprising: a boot having support surfaces adapted to be supported directly by said upper support surfaces of the ski, said boot having said front and rear bars. 30. A cross-country ski system according to claim 26, wherein: the upper support surface extends to an outer transverse edge of the upper surface of the ski. 31. A cross-country ski system according to claim 26, wherein: the upwardly facing recess of the location for receiving the binding device extends within an area corresponding to a metatarsophalangeal bending zone of the wearer's foot. 32. A cross-country ski system according to claim 26, wherein: the ski has no boot sole-engaging rib projecting from a longitudinal median plane of the ski. 33. A cross-country ski system according to claim 32, wherein: the binding device further comprises a boot sole-engaging rib rearward of an entirety of the mechanism to engage the boot to bind the boot to the ski. 34. A cross-country ski system according to claim 26, wherein: the binding device further comprises a boot sole-engaging rib rearward of an entirety of the mechanism for binding engagement with the boot. 35. A cross-country ski system according to claim 26, wherein: the upwardly facing binding-receiving open recess is structured and arranged to receive a width of the binding device. 36. A cross-country ski system comprising: a cross-country ski comprising an upper surface including a longitudinal central zone constructed and arranged to receive a binding device to be connected to a part of the boot in an area corresponding to a metatarsophalangeal bending zone of a wearer's foot for binding the boot to the ski;the longitudinal central zone of the ski comprising a binding zone for receiving the binding device, said binding zone having a width less than a transverse width of the ski in the longitudinal central zone;the longitudinal central zone of the ski further comprising at least one upwardly facing boot support surface extending laterally in a direction from said binding zone;the location for receiving the binding device comprising a binding-receiving open interruption in the upper surface of the ski, said open interruption further extending downwardly at least partially to a depth below said upper surface of the ski. 37. A cross-country ski system according to claim 36, further comprising: an upwardly projecting guide rib extending upwardly in the longitudinal central zone structured and arranged to engage with a downwardly facing longitudinal groove of the boot. 38. A cross-country ski system according to claim 37, further comprising: the binding device, said binding device comprising said guide rib. 39. A cross-country ski system according to claim 36, wherein: the ski includes no baseplate on the ski in the longitudinal central zone. 40. A cross-country ski system according to claim 36, wherein: the upwardly facing binding-receiving open interruption is structured and arranged to receive a width of the binding device.