Some Bane's fans often interested in a question that why Bane wearing a mask? In the google you can find many answers that others give.

The reason that Bane wears the Bane masks is because he has to be dosed with a supply of a drug called "venom". This drug is why he is so fast and so strong. He was already incredibly smart before the drug. The drug was forced upon him back at the prison where the guards and that doctor tested it on him. They did this because they were testing a lot of the inmates and Bane could tolerate it.

The venom is actually supposed to go into his brain via tubes, but that would have involved almost a whole extra movie. In the end the movie had many clashes with the comics but was an awesome movie....this is what Bane is really supposed to receive but after reading the other posts Nolan could've have just rewrote some stuff about pain.

As Bane mask are well known, some shops start selling Bane mask and Bane jacket now! The famous like amazon , and some online shop. So, if you are interesting it, you can find!