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Mapping the hair
Maxwell Render uses two UV channels to map the hair along the hair fiber and also map the root UVs. The UV channels used are 0 (root to tip) and 1 (root UVs). By default the generated hair already has root to tip UVs so if you only want to use a texture along the hair fiber, but not across the surface of the hair, you can simply apply a Maxwell material to the hair and attach a texture to any of the texturable input ports (most likely the reflectance 0 port of the BSDF node). If you wish to also use mapping across the surface you must first transfer the UV map of the generating hair mesh to the hair, using the Transfer Map option in the SI hair menu.
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