The Ridge Runner series bags are a great value but they've got all the same kind of awesome features that are in the Sierra Designs higher quality bags. So you've got an ergonomically shaped hood, an ergonomically shaped foot box, a draft tube that runs along the zipper, a really easy-to-use jacket zipper, removable padlocks if you want to attach your sleeping pad. The Ridge Runner also has a full-length zipper which you can unzip from either side which is a really nice feature. If you get a little warm, you can stick one of your feet out as well. 30D Polyester Micro Ripstop outer and a Polyester lining that's really soft and comfortable to sleep inside. EN tested to zero, fifteen or thirty. It's a 600 fill down.