 The CBOE Volatility Index and VIX-related exchange traded funds surged on Monday on fears of a contagion from problems in Chinas property market that would spread to global markets. Among the best-performing non-leveraged ETFs of Monday, the iPath Series B SP 500 VIX Short Term Futures ETN NYSEArca: VXX increased 9.5 and the ProShares VIX Short-Term . 