Kith's Williams III hoodies are made by Flexcon Limited in Guangdong, China, a knit specialist that also produces for Rip N Dip and Diamond Supply Company. The factory requires a 1,000-unit minimum order and has no public website, only phone contact through Mr. Alan Mu.
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Here's how Kith makes their Williams III hoodie, crewnecks, and a bunch of other products. Flexcon Limited is a clothing manufacturer located in the Guangdong province in China. Although they offer a lot of different products, their main specialty is knits such as turtlenecks, crewnecks, hoodies. They also manufacture for other brands like Rip N Dip and Diamond Supply Company. They don't have a website, but you can reach out to them by phone and ask for Mr. Alan Mu. Their minimum order quantity is 1,000 units. Sadly, this does make it a little bit more challenging for smaller clothing brands that use them as a manufacturer. Let me know which product I should do next.