The authors develop a conceptual model of factors that determine behavioural intentions to buy co-branded products. The model is an extension of the Simonin/Ruth model. Structural equation modelling serves to test the hypotheses. Product fit has the strongest effect (of the exogenous factors) on behavioural intention. Marketers should gain a detailed understanding of consumers' perceptions of product and brand fit with partner brands and establish positive associations before leveraging a brand as a co-branded product. Buying intentions for co-branded products can be increased by marketing to brand-conscious consumers, consumers with variety-seeking tendencies, and highly involved consumers.