I use VIXY. I'm in some of that right now waiting for the market to go down a few days. I have about 2700 shares right now, so pretty substantial and looking for a rubber band moved from $19 to $24+
Off Topic not related to GNBT: Looking for simple way(s) to short the overall market when the time is right. I tend not to short individual stocks and I don't trade options at all. Any suggestions?