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When work undertaken at a height is of short duration, or for technical reasons the provision of a working platform, suitable barriers and other similar safeguards is impracticable, then the prevention from falling from a height while performing correctly the related work activity can be achieved by the use of personal fall protection equipment. DIN EN 358 applies to belts and lanyards intended for the purpose of work positioning or restraint. It specifies the requirements, testing, marking and information supplied by the manufacturer. It does not cover restraint lanyards with a fixed length which are not integrated into a belt. These are covered by DIN EN 354. Equipment when manufactured in accordance with DIN EN 358 is intended either to prevent the user from reaching a position where a fall can occur (restraint) or to secure the user safely in position at the point of work in such a way that the user can share and control his weight between the waist and the feet (work positioning). It is essential to note that such personal fall protection equipment by design does not meet the requirements necessary for the purposes of fall arrest. It may be necessary to supplement it with collective or personal means of protection against falls from a height. Its safe use, in practice, relies upon the effective training and instruction of the user. Work positioning belts or restraint belts are not suitable if there is a risk of uncontrolled slippage by the user, e. g. when working on a steep roof or wet or slippery surfaces, which could result in the user being suspended by or exposed to unintended tension by the belt.