Material Editor > Type button > Material/Map Browser > Set Compatible With to Renderer (if necessary) > Double-Sided
The Double-Sided material lets you assign two different materials to the front and back faces of an object.
Note: If even one sub-material has its shading set to Wire (see Shader Basic Parameters Rollout), the entire material displays and renders as a wire material.
To create a double-sided material:
In the Material/Map Browser, choose Double-Sided and then click OK.
A Replace Map dialog is displayed. This dialog asks whether you want to discard the original material in the slot, or retain it as a sub-material.
The Double-Sided material controls let you choose the two materials, and the translucency of the material overall.
To make the material translucent:
Set Translucency to a value greater than 0.
The Translucency control affects the blending of the two materials. When Translucency is 0, there is no blend. When Translucency is 100.0 percent, the outer material is visible on inner faces and the inner material is visible on outer faces. At intermediate values, the specified percentage of the inner material "bleeds through" and is visible on outer faces.

Translucency—Sets the amount that one material shows through the other. This is a percentage that can range from 0.0 to 100.0. At 100 percent, the outer material is visible on inner faces and the inner material is visible on outer faces. At intermediate values, the specified percentage of the inner material "bleeds through" and is visible on outer faces. Default=0.0.
Facing Material and Back Material—Click to display the Material/Map Browser and choose a material for one side or the other.