The melon is moderately bulbous and slopes steeply downward before merging with the beak. The beak is long, slender with a straight mouthline.
Males and females have similar pigmentation patterns. The front half of the rostrum and the dorsal region from posterior to the blowhole and anterior to the dorsal fin is light gray to white. This lighter coloration on the dorsal surface extends ventrally to the throat region via a narrow band that passes posterior to the eye. A black mask extends from the tooth back to the blowhole and encompasses the area immediately around the eye. This darker coloration extends through the angle of the mouth, and reduces to a narrow band across the chin. The flippers and remainder of the animal are black, with the anal region and posterior edge of the flukes the only other gray areas.
Adult body length ranges between 5.2 to 6.2 m. Recorded maximum body length for adult males and females is 5.8 m and 6.2 m, respectively. Length at birth is 2.8 m.
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