In the last trading session, U.S. stocks managed to hold onto gains in what was overall a rocky session. Among the top ETFs, SPY lost 0.2%, DIA shed 0.2% and QQQ moved 0.5% lower on the day.Two more specialized ETFs are worth noting as both saw trading volume that was far outside of normal. In fact, both these funds experienced volume levels that were more than double their average for the most-recent trading session. This could make these ETFs the ones to watch out for in the days ahead to see if this trend of extra-interest continues.DGRW: Volume 8.39 Times AverageThis dividend ETF was in the spotlight as around 3.9 million shares moved hands compared with an average 509,000 shares a day. We also saw some price movement as DGRW added 0.3% in the last session.The movement can largely be blamed on rising coronovirus cases that has raised the appeal for dividend investing. DGRW has plunged 3.8% over the past month and carries a Zacks ETF Rank #3 (Hold) with a Medium risk outlook.IWS: Volume 3.38 Times AverageThis mid-cap ETF was under the microscope as nearly 1.6 million shares moved hands. This compares with an average trading volume of roughly 477,000 shares and came as IWS added 0.1% in the last trading session.The move was largely the result of heightened uncertainty and volatility that could have a big impact on mid-cap stocks like the ones that we find in this ETF portfolio. IWS has declined 5.3% in a month’s time and has a Zacks ETF Rank #3 with a Medium risk outlook.Want key ETF info delivered straight to your inbox?Zacks’ free Fund Newsletter will brief you on top news and analysis, as well as top-performing ETFs, each week. Get it free >>Want the latest recommendations from Zacks Investment Research? Today, you can download 7 Best Stocks for the Next 30 Days. Click to get this free report SPDR SP 500 ETF (SPY): ETF Research Reports Invesco QQQ (QQQ): ETF Research Reports SPDR Dow Jones Industrial Average ETF (DIA): ETF Research Reports WisdomTree U.S. Quality Dividend Growth ETF (DGRW): ETF Research Reports iShares Russell MidCap Value ETF (IWS): ETF Research Reports To read this article on Zacks.com click here. Zacks Investment Research Want the latest recommendations from Zacks Investment Research? Today, you can download 7 Best Stocks for the Next 30 Days. Click to get this free report