Being outdoors is always fun, but you never know when it may rain. Luckily, waterproof ball caps are available, we are happy to introduce waterproof caps. At YOUKI, we know how to craft premium waterproof caps using the best materials starting with technical nylon and organic cotton. After we pick the best materials, we head to our tech centr.... our 70 computerized knitting machines to manufacture waterproof caps at a larger scale. Quality is important to us, so we inspect. We take some time to partner with other companies to get the baseball cap styles that are in line with their brand, each style is custom to each of our partners. We have premium waterproof caps because we have ethical certifications, we are environmentally responsible.