That's because, growth in cash flow enables these companies to expand their businesses without depending on expensive outside funds.Right now, year-over-year cash flow growth for Crocs is 11.6%, which is higher than many of its peers. In fact, the rate compares to the industry average of -12.9%.While investors should actually consider the current cash flow growth, it's worth taking a look at the historical rate too for putting the current reading into proper perspective. The company's annualized cash flow growth rate has been 53.1% over the past 3-5 years versus the industry average of 1%.Promising Earnings Estimate RevisionsBeyond the metrics outlined above, investors should consider the trend in earnings estimate revisions. A positive trend is a plus here. Empirical research shows that there is a strong correlation between trends in earnings estimate revisions and near-term stock price movements.There have been upward revisions in current-year earnings estimates for Crocs.