Object e.g. surfboard, fastening device for use in e.g. board sports, has fastening unit comprising slat whose length is determined such that slat surrounds half of peripheral zone of person`s limb in stable position
The device has a fastening unit (3) comprising a slat (5), which is formed of steel and presents an unstable position in which the slat is rectilinear and a stable position in which the slat is wound on itself. Length of the slat is determined, such that the slat surrounds half of a peripheral zone of a person`s limb in the stable position. A protective covering (6) houses the slat. The fastening unit is fixed on a flexible linking unit (4) using a connecting unit (7). A locking unit surrounding the limb area includes an attachment (9) and self adhesive units with buckles and hooks. An independent claim is also included for an assembly for associating a fastening device to an object.