I got this shirt when I caught Power Trip at the London Underworld a couple years back. The bill was Blkout, Power Trip and Bane while they were touring on their Manifest Decimation album.
The front print is basically an excerpt of the face on the Manifest Decimation album cover while the backprint is a large shot of the tour dates and reads 'European Decimation '13'
This was a fun and rowdy crowd in London. A lot of beers and moshing went down. If you dig Power Trip, be sure to check out all the other bands currently on Southern Lord Records.