A shock absorber for a vehicle seat belt comprises a flexible crushable pad (50) positioned between the shoulder strap (20) of a seat belt and the shoulder of a user (26). A clip (58) secures the crushable pad (50) in a predetermined position in relation to a seat back (12). The clip (58) permits movement of the pad (50) further from said seat back (12) on application of a predetermined force, e.g. in an accident. <IMAGE>
