The invention refers to a ski boot sole (12) and a ski binding (30). The sole consists of a toe part (TP), a metatarsal part (MP) next to the toe part (TP), a rear part (RP) extending from the metatarsal part (MP) to the rear end (R) of the ski boot sole (12) and a front part (FP) extending from the toe part (TP) to the front part (F) of the ski boot sole (12). The front part (FP) consists of a ski binding attachment (20) consisting of an extension (15) which is locked into a slot (32) to ensure that forces are absorbed in the binding. The binding (30) consists of a base plate (31), a positioning channel (22), a slot (32) in the ski binding's side walls and it has a friction pattern (29) and (16) where at least two side walls (33) are located on each side of the binding's (30) longitudinal centre axis (1). A locking mechanism (35) is attached to the base plate (31). A ski boot attachment (40) consists of a clamping bar (27) and a clamping arm (41) with a hinged connection to the base plate (31). Clamping arm (41) which is hinged in base plate (31) has a point of rotation located immediately above the base plate. In this point of rotation the lever arm (26) is located which is connected to a point of rotation in locking plate (25). Locking plate (25) in turn is attached to a point of rotation on the base plate (31). On closing the binding (30), locking plate (25) will transmit force via the lever arm principle and clamp clamping arm (41) down against the extension (15).