Nanyang Textile Group, a Bangkok manufacturer, makes Nike gear from fabric development through assembly. They created Nike's Tech Fleece and run factories across Asia plus Kansas City. Their website has detailed process videos and they respond to inquiries within 48 hours.
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Here's how Nike makes some of their clothing. Nanyang Textile Group is a clothing manufacturer and distributor based in Bangkok in Thailand. They run a fully vertical operation offering both fabric development and garment assembly. I really like their website because they show examples of them weaving the fabric in very high quality video. They also have a YouTube channel where they show their process for developing garments. According to my research, Nanyang was responsible for developing the Tech Fleece fabric on behalf of Nike. Clearly these guys know what they're doing, especially especially when they're manufacturing at the scale of Nike. They have locations all across Asia as well as Kansas City in the US. Contacting them is really easy. They typically answer within 48 hours and they have a button for it directly on their website. Let me know which product you want to see next.