Their armor is a variation of magical power armor designed specifically for Pegasi by Rarity

and Rainbow Dash

themselves in a pre-war collaboration. The armor offers excellent damage protection and incorporated weapons without sacrificing its aerodynamics. The suit's helmet offers its own E.F.S. and inventory sorter, as well as a targeting system to be used in conjunction with the wearer's Battle Saddle. The scorpion-like tail can also be used as a ferocious melee weapon"From: falloutequestria.wikia.com/