Diasec Anti-Reflective acrylic
Also known in our profession as the matt version.
The acrylic has a structure like a matt photoprint. It keeps away reflections that you exprerience with gloss acrilic when an artwork is right opposite a window section. In that case the solution can be found in a matt finish.
However the finish is lowering the contrast of the image slightly, it can give portrait a beautiful look. The softness of the finish can make skintones just a soft as real skin. In some cases it can give artwork a spectacular soft effect.