As long as the one who wields it has willpower and strength to control it they will have power over the physical world. The ring is considered to be one of the most powerful weapons in the world and at the same time that makes it one of the most dangerous weapons as well.
DC Comics gave us the first Green Lantern, Alan Scott, in 1940. The other members of the Lantern Corps followed and now with the release of the 2011 Green Lantern Movie, starring Ryan Reynolds, this costume is going to be a popular choice for kids and for adults. There are also kid party supplies with a Green Lantern theme.