Based on a hair shader developed by Disney, this set of Shader Presets for Strand-Based Hair enhances the appearance of hair in Daz Studio when using ‘Iray Curves’.
Iray Curves are useful because they significantly reduce the vertex count of Strand-Based Hair while simultaneously creating a smoother hair strand. The downside is that the default ‘Blended Dual Lobe’ hair shader does not render out some physical properties, namely hair translucency, for Iray Curves.
This Gossamer shader, unlike the default shader, retains realistic hair properties such as translucency when using Iray Curves.
https://3dshards.com/product/gossamer-hair-shader-for-strand-based-hair/