For the ultimate way to keep a kidnap victim or prisoner under control, a tight rubber hood MUST be used…
Tight Rubber Hood
Chained up, gagged and hooded for your pleasure…
Heavy Bondage 
Nice pictures collection of rubber hoods would love being pointed into the direction of the manufacturers if possible seeing that I would like having a custom designed and manufactured rubber hood to my own rubber kink while having the ability to ensure utmost isolation restrictions as well as being able to be used for solo and long term usage. Not forgetting breath control automatically inducing some sort of suffocation and strangulation.