Warren Buffett, who many consider to be the greatest investor ever, fancies companies that have a competitive advantage. This is a valuable attribute that helps to keep rival corporations at bay. And owning these types of businesses can be hugely beneficial to one's portfolio because these stocks can provide solid long-term returns. 

With that framework in mind, it's time to turn our attention to (NASDAQ: CROX). The popular footwear stock has soared 491% (as of June 16) over the past five years thanks to rising sales and profits. But key to its success is a competitive advantage that investors need to know about. 

Continue reading to find out if this powerful trait makes Crocs a screaming buy right now. 

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Source Fool.com