A flexor for use in a ski binding or mounting plate for a cross country or touring ski, comprises an extending flexor arm and a holding and positioning portion, wherein the extending flexor arm is connectable to, or integral with, the holding and positioning portion such that the extending flexor arm can rotate and/or displace with respect to the holding and positioning portion around the point of connection between the two. The extending flexor arm is formed such that the amount of displacement of the extending flexor arm as a result of an applied force acting thereon follows a substantially linear relationship, up to a first desired amount of displacement. For a displacement of the extending flexor arm greater than the first desired amount of displacement, the amount of displacement of the extending flexor arm as a result of an applied force acting thereon follows an approximately exponential relationship.
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