The String Ridge VST 1.5 is an ultralight trekking-pole shelter with a hybrid single/double-wall build in Big Agnes's HyperBead fabric, packing down to 655 g. It's rated 3-season and built for ultralight use, pitched with trekking poles rather than dedicated poles, so the weight savings come at the cost of needing poles of the right length and a flat, stake-friendly pitch.
The 1.5 capacity is the point of the design: it's sized for one person plus real breathing room for gear, boots, or a dog inside, without jumping all the way to a 2-person floor plan and its extra weight. No footprint is included, though one is sold separately for hikers who want extra floor protection on abrasive ground.
This suits solo thru-hikers and ultralight backpackers who already carry trekking poles and want more interior space than a strict 1-person tarp tent offers, in mild to moderate 3-season conditions rather than sustained storms or snow load.