The effects of options framing can be theoretically explained by loss aversion principles as well as by potential alternative explanations (e.g., sensitivity to price differentials). This paper examines the interaction effects between option framing and two types of cognitive constraints (availability of cognitive resources and additional redundant product information) on consumer choices for adding or deleting optional product features. In the process, the research attempts to provide empirical support for one theoretical model (e.g., loss aversion principles) versus the other (e.g., sensitivity to price differentials). The results support the hypotheses that consumers choose a higher number of product options when starting from a fully loaded model than from a base model, and that this effect is magnified when consumers make choices under high cognitive constraints. In essence, the results empirically support the theoretical premise of the effects of option framing being driven by loss aversion principles than by diminished sensitivity to price differentials. © 2008 Wiley Periodicals, Inc.