Compact leaf warbler with two whitish wingbars (one broad and prominent), greenish-gray upperparts, an indistinct crown stripe, and conspicuous white tips to the innermost flight feathers. Bill and legs usually dark. Breeds in alpine shrubbery in mountain ranges flanking the Tibetan Plateau. Winters mostly in the plains just south of the Himalayas, but also on wet hilltops farther south. Often heard but not seen, it is best told from other leaf warblers by its distinct “chew-wee” call. Prone to long-distance vagrancy.