Glottalization in A'ingae (or Cofán, an understudied Amazonian isolate, ISO 639-3: con) is a laryngeal feature of the metrical foot. The proposal entails that traditional structures available to metrical theory (Hayes 1995) must be enriched by allowing the association of features such as glottalization to metrical constituents. Surface position of glottalization is determined through the interaction of Optimality Theoretic constraints: GlottalNonFinality, Align(GlottalStop, Foot-R), and *LightHeavy. The proposal accounts for the limited distribution of glottalization, its interaction with stress, and its susceptibility to deletion by dominant (stress-deleting) suffixes. Finally, derivational—but not inflectional—morphemes are proposed to undergo phonological evaluation with the root, which accounts for the cases of apparent glottal metathesis as a consequence of cyclicity.