I was also disappointed in that the gorgeous Kokatat brochure that came with my order prominently boasted Made in Arcata CA since 1971. But the first thing I saw on the Nomad box was MADE IN CHINA. In all fairness, when reading closer on Kokatat's website I found this:
"Yes, we do source items in Asia. But, only for products that do not have scalable infrastructure here in the US and to support our environmental commitment to Gaia® PVC free flotation foam for all our life vests, available exclusively through our Asian manufacturer."
I've found them comfortable even over bare feet for warm water paddling -- in colder conditions I will add wet suit socks inside. My feet have not noticeably sweat inside them on 80 degree days. The only potential drawback is they are a little bit of a struggle to pull on, not having any zippers. Someone with thicker or low flexibility ankles or with very muscular or plump calves might have fit problems with them, so try them on before committing to them.