The footprint fits my Hyperlight AST pretty well. The footprint stake loops tend to be a little farther out than the tent stake loops, but the pole grommets line up nicely. The material is not much thicker than the tent floor, but definitely adds a layer of protection. It worked great on a 2 day hike, as it packs down light and can fit in the AST's included tent bag. It also includes a mesh stuff sack and hook-and-loop strip for securing the poles if you want to use the rain fly/footprint option.

Used this footprint while on a 2-week pack in Alaska. Great for all kinds of terrain and keeps most, if not all, moisture out (even in a downpour). Gotta hand it to Sierra Designs when it comes to tents and tent accessories.