Hermes Mk.IV Flight Armor

The pegasus you see here is supposed to be Soarin, but the scanner decided to not register the extremely light blue color of his coat...

What he is wearing right now is the "Hermes" Mk.IV Flight Armor, which includes a helmet with built-in HUD, IFF, and communications features, a small jet engine on the back (hidden by his wing) which allows the wearer to double or even triple their top speed, vertical stabilizers (on the lower hind legs), and a new jumpsuit which cuts down on the G-forces caused by the high speeds.

This might be featured in a possible story as well...

MLP:FiM (c) Hasbro