In theory, it would make sense for all waterproof jackets to be windproof, as well. When you think about it, the principle that is utilized to ensure waterproofness and breathability should also work to protect you from the wind. After all, most models will prevent water and moisture from entering in but also allow for airflow to optimize the breathability. However, this theory can’t be claimed for every model. While most will probably be windproof, there is always an exception to the rule.