In the last trading session, Wall Street was extremely upbeat. Among the top ETFs, SPY added 3.1%, DIA gained about 2.6% while QQQ moved 3.1% higher 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.XLB: Volume 2.88 Times AverageThis materials ETF was under the microscope as about 15.13 million shares moved hands. This compares with an average trading volume of roughly 5.25 million shares and came as XLB gained more than 3.6% in the last trading session. XLB is down 2.1% in a month’s time.HYMB: Volume 3.26 Times AverageThis high-yield muni bond ETF was in the spotlight as around 2.54 million shares moved hands compared with an average of 778,730 shares a day. We also saw some price movement as HYMB gained 1.2% in the last session. HYMB has slumped 3.7% over the past month. 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 Invesco QQQ (QQQ): ETF Research Reports SPDR S&P 500 ETF (SPY): ETF Research Reports Materials Select Sector SPDR ETF (XLB): ETF Research Reports SPDR Dow Jones Industrial Average ETF (DIA): ETF Research Reports SPDR Nuveen Bloomberg High Yield Municipal Bond ETF (HYMB): ETF Research Reports To read this article on Zacks.com click here. Zacks Investment Research