Is your vinyl skirting blowing away?
These windrods are made of stiff metal that slide down in the seam of the skirting panel. The hook slips up into the top track. Once installed, the windrods prevent the top of the skirting from blowing out yet still allows the skirting to slip up and down inside the top track. Install one windrod every 2-3 seams.
Once the windrods are installed, you can then prevent the bottom from blowing out by installing a screw through the bottom track into the panel. Do this every 2-3 panels.