I weigh 80kg myself. I sit a lot, 8 hours a day, as I work at a computer. The skin cracked after 7 months of use with a fairly careful attitude. Whether this is normal or not is up to you. Before that, there was a thunderx chair, it started to crack only after 1.5 years, although it costs less.
I thought it would be helpful to include some photos to illustrate my experience.
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