Deflective hull plating

Deflective Haul Platting or DHP was a new technology developed by Starfleet in 2382. (STP)

DHP was a state of the art protective and stealth material that could completely cover a small ship in its defense. It was adapted from the advance technology that had been found attached to the USS Voyager (NCC-74656) upon its return home. 

The first Starfleet vessel to be equipped with DHP was the USS Ares (NX-19803) in 2382 ("The Boolran Eye, Part 1")