According to 'A Blog to Watch,' they're using caoutchouc rubber which is a natural rubber. If this is accurate, I'd be a little concerned. It's susceptible to prolonged sunlight exposure, hotter temperatures (> 30C), as well as bacterial degradation. In other words, not very resilient.
I would presume their engineers have developed a treatment for it or created some specific derivation which increases its durability. However, I don't know. While I seem to be in the minority whom like the looks here, this even has me feeling some trepidation.
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