UDOW is a heavily levered bet on the Dow Jones Industrial Average, achieving 3x exposure to the index via futures contracts and other financial derivatives with counterparty risk. Like many levered funds, it delivers 3x exposure only for 1 day. Over longer periods, returns can stray from the intended 3x exposure to the DJIA, which means it doesn't pay to hold onto UDOW for long if the trend is not positive. The Dow is an under-diversified index of 30 companies that weights its constituents by an arbitrary statisticprice per share. However, the Dow's shortfalls are less salient in a levered, short-term product where diversification and weighting are less important. Trading costs, on the other hand, are very important to take into consideration. Don't jump in unless you fully understand the relative risks and rewards of levered vehicles.