SSS is sub-surface scattering, And I hate it! In 3D circles It is the name given to the effect of light as it enters our skin and reflects back through the layers. It is a pain to set up, and each little tweek has to be rendered for at least 15 minutes just to see the results of the adjustment. I tried the effect on the model in the previous post. It has taken hours to try to get right. I think it gives a more natural look to the skin. I just need to work out how to gloss the lips