Alternatively it's an armored glove with shock frills, which pretty much amounts to the same thing.

http://www.popsci.com/diy/article/2011-05/...ing-development

i wonder if the plastic part is stab and cut proof, as then one have something to put between oneself and any knife wielder.

Now if only I lived in a country where defending myself was a legitimate reason for dropping someone down as hard as possible...