The advanced power armor worn by factions such as the Brotherhood of Steel and the Enclave in the Fallout series is probably one of the most widely recognizable suits of armor in video game history. Unfortunately, this suit really doesn't provide the wearer with any supernatural abilities; it's all pretty standard stuff... as far as video games go, anyways.
Made of poly-laminate composite, the T-51b is lightweight for its bulky size and can absorb over 2500 joules of kinetic impact. I'm no scientist, but that sounds like a lot. A coating on the shell of the armor reflects laser and radiation emissions.