If you are splinting an arm and have applied a sling you should also restrict motion with a swath.
swathe
swathe
Swathe
Swathe
Swathe
Swathe
Swathe
Swathe
A splint and sling are what immobilize the extremity.
Swathe
It is called a swath or binder.
Cloth or improvised swathes of fabric. SABC-Swathe
Cloth or improvised swathes of fabric. SABC-Swathe