User blog comment:Kogath/Monster Hunter: World Discussion/@comment-32887192-20171004193309

For the mantle part of this page, we also have the Waterproof Mantle allowing for better movement through water so I assume water will have an effect on the way your hunter will move and fight (maybe slower). I know this is pretty old news but it has not been updated with this feature :).

https://youtu.be/LpC7AHY0ZpU?t=23m18s