Quite a while back the devs released this information.
Elements
Increases damage dealt by attacks of that element
Reduces damage taken from attacks of the opposing element

We know, wind beats fire, fire beats ice, and ice beats wind.
And that earth beats thunder, thunder beats water, and water beats thunder.

So when we see opposing elements, I and several others (friends, posts, blogs, etc) were under the impression that wind increased fire resistance.

But, now with the summer event, the swim suits offer fire resistance but instead of wind, we find water. Could you please stop being so confusing about the elemental system and just release what does what. The other offensive/defensive mechanics are not near as confusing.

Right now the system goes forward backwards and side ways.
___(Defensive)
_____Water
_______V
Wind > Fire > Ice (offensive)
_______V
______????

Maybe it's just me, but this is way to complex for a game that is trying to appeal more to a casual crowd, and even complicates the 11 system.