Pillar inside Addon Pack 2
The Pillar provides a fixed width sidebar with responsive content.
Fixed Width Sidebar for Foundation
Pillar is on the left side of the screen on this site. It is a great fixed width sidebar that can contain lots of different content. As you can see on this page, it is using the Side Nav stack to bring in the navigation of the site. Pillar works great in conjunction with Off Canvas for great mobile navigation options.
Check out the dedicated Pillar Sample Site page.