I'm pretty heavy at 120kg and they take my weight fine. They have a long back - I'm 187 cm (6ft 1.5in) and I can rest my head against the cushioned head rest. They are very light and pack down small approx. 30cm x 10 cm x 10cm bag.
We have a couple of zero gravity chairs. They are high backed, incredibly comfortable! But maybe not so lightweight , though by no means really heavy. We will take these in our motorhome for longer journeys, small camping chairs for the odd few days away.