Thickness is definitely thinner than a normal 1mm thick Nato. Don't have a vernier caliper so I'm not sure about the exact thickness.
I've only got it for a few days, but so far there's no stretching. Washed it once and it seems to hold up fine too.
The heaviest diver I have and tried on was a stainless steel Seiko Samurai, and it was perfectly secure and comfortable for me.
Overall, I think it's worth the purchase, around SGD18 and 1 week of shipping time from Europe.
Besides, it's the only place I've seen that has 22mm so might as well get one before it's out of stock