Abstract: A device for attaching a boot (5) to a ski (11), especially a cross-country racing or cross-country touring ski, comprising a locking assembly (12,12b,14) on the ski (11), which co-operates with portions of the user's footwear for the attachment thereof to the ski. For the purpose of achieving a lockable connection between the boot and the ski which secures a good side guidance as well as free and unobstructed lifting movement upwardly to a correct, limited degree, at the same time permitting an orthopedicly correct boot, such as an ordinary hiking boot to be used, the present invention discloses a novel locking assembly (12a, 12b, 14) which is provided on the ski, when can co-operate with attachment portions (6, 7) which are defined in the footwear sole surface (1) in the area of the toe portion (2') of the foot.