NEW YORK ( TheStreet) -- Companies that sell exchange traded funds occasionally release evolutionary products. That may be the case with the recently listed WisdomTree International Hedged Equity Fund ( HEDJ), which protects against currencies. When a U.S.-based investor buys a foreign stock or fund, he also is buying the local currency. If that currency rises against the dollar, he gets a boost on returns. An advancing U.S. currency puts a drag on performance. The WisdomTree International Hedged Equity Fund takes that variable out of the equation. That's beneficial, as for most of the past decade, the dollar has weakened. The WisdomTree International Hedged Equity Fund has the same equity exposure as the WisdomTree DEFA Fund ( DWM). The DEFA Fund is essentially the same as the iShares MSCI EAFE Index Fund ( EFA), with the difference being that the WisdomTree fund is weighted by dividends, and the iShares Fund is weighted by market value. In the hedged fund, there is the hedging of the currency on top of the dividend weighting. The hedge is accomplished with forward contracts that neutralize the movement of the currency proportionally to the country weights of the equities in the fund. The U.K. is the largest country in the fund, at 20%, so the currency allocation is targeted to be the same. Based on the back-test of the ETF, the difference between hedging and non-hedging can be significant. The average annualized return for the DEFA Fund for three years has been minus 1.81%, 8.03% for five years and 6.78% for 10 years. With currency hedging, those numbers would have been minus 4.51%, 6.26% and 4.55%, respectively. Because the dollar has been falling, the hedged version of the index didn't get that benefit.