Ortovox 320+ pfa Probe 2012: Tour-goers everwhere are raving; the Ortovox 320+ pfa Probe offers the most extension and fastest extension time out there. The pfa quick-release tensioning system allows a stretching in seconds and an equally swift collapsing and folding. Plus with features like the EVA foam grip and steel cable pull line, the 320+ pfa Probe is a standout for a reason