Hairtrix consists of two formerly independent plug-ins, hairfx and Ornatrix that can now be used in concert to create amazing hair and fur effects. Both Ornatrix and hairfx are production-proven hair creation and simulation tools for 3ds Max and they provide users with a multitude of advanced tools for creating realistic hair and fur, and simulating its movement.
With hair creation and simulation, it has always been difficult to achieve good results in a reasonable time frame. Getting hair to look believable is a hard task on its own. Having that hair animate believably can be even harder. The basic idea behind Hairtrix has been to make a combined generalized framework of tools that allow creation, manipulation, and rendering of sub-pixel objects such as hair. This is no easy task because of the complexity level of structures that have to be dealt with. However, Hairtrix makes creating and animating realistic hair and fur quickly and efficiently a reality.
You can easily these plugins here: