Van Eck's Market Vectors Investment Grade Floating Rate ETF (NYSEArca:FLTR) meanwhile has a gross annual expense ratio of 0.49 percent, but a net expense ratio of 0.19 percent. The WisdomTree Global Real Return Fund (NYSEArca:RRF) is designed to give investors capital appreciation and income that exceed the long-term rate of inflation, according to paperwork the company filed with U.S. regulators this week. RRF, which will join a crowding field of ETFs designed to deal with rising rates and inflation, will have a particular focus on commodities-rich economies in developed as well as emerging market countries.