What counts as an 'ultralight' tent?

In the specialist communities we read, ultralight typically means a trail weight under roughly 3 lbs for a 1-person shelter and under about 4 lbs for a 2-person. Trekking-pole single-wall designs hit those numbers more easily than freestanding double-wall tents. Budget 'lightweight' tents from brands like Clostnature and entry-level Kelty models are heavier than that bar but get grouped in because they're marketed for backpacking.