All admit that they wear the bands only because they think it looks good. Thanks, AnswerParty.
Physical restraint refers to the practice of rendering people harmless, helpless or keeping them in captivity by means such as handcuffs, fetters, straitjackets, ropes, straps, or other forms of physical restraint. Alternatively, unarmed combat techniques or sheer force of numbers may be used to restrain a person.
British Police officers are authorised to use leg and arm restraints, if they have been instructed in their use. Guidelines set out by the Association of Chief Police Officers dictate that restraints are only to be used on subjects who are violent while being transported, restraining the use of their arms and legs, minimising the risk of punching and kicking. Pouches carrying restraints are usually carried on the duty belt, and in some cases carried in police vans. Sports