They are thin, yes. And they're relatively heavy compared to cottage industry gear. However, for the price, it's hard to beat them on comfort-to-weight.
A poncho liner is usually good for most folks down to 45-50* (I can usually push one down to freezing, but I'm also a nearly inhumanly warm sleeper). A no-sew PLUQ is usually good down to about 40-45* for most folks. If you add insulation to a PLUQ, it can go as low as the twenties (I've been warm down to
25* comfortably with the supplement of a single layer of InsulBright, and I've survived at 21*--I was cold that night).
They're cheap and readily available. That makes 'em great for someone just finding out if they're interested in this whole "camping" thing.
Hope it helps!
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