Stealth ablative coating is a black-colored material found on UNSC stealth ships. It serves to refract both UNSC radar and Covenant sensors, making the ship invisible to radar, similar to the way Active camouflage cloaks something from eyesight. The coating must be maintained perfectly or it will return radar signals. This necessitates constant maintenance on the entire coating. Therefore, virtually all UNSC prowlers have relatively small surface areas, so that less has to be maintained. An exception to this is the UNSC Point of No Return, which is a Prowler the size of a UNSC destroyer. Stealth ablative coating can also be found on Long Range Stealth Orbital Insertion Pods.