They are not Plastic, they are rubber. I have some pants from this company, yes they are expensive but the quality is excellent. They are the best pants I have ever owned. As for the zips, for practical use I see them leaking!
Yes they ship to the USA, go to the bottom of there home page and you will see a link to "Payment and Delivery" shipping costs to all countries can be found there.According to the site, there is a rubber flap that fits between the interior of the pant and the zipper that prevents leaks. Anyone know if they ship to the US?