White Bloon

White Bloons are the same as Black Bloons, except they are the color white, and instead of being immune to explosives, they are immune to Ice Towers

Sending White Bloons
If your opponent is using a strategy based around the Ice Tower, then be sure to scare him with some White Bloons. If he isn't it still might be a good idea to rush him with some.

Defending White Bloons
Building towers with decent popping power will do. Triple darts or 2-2 boomerang should work just fine.

Summary

 * White Bloons are immune to Ice Towers