Yes, you can tan through mesh, but the degree to which you tan will depend on the thickness and density of the mesh. If the mesh is tightly woven, it will block more sunlight, resulting in a less noticeable tan. On the other hand, a more open or loose mesh will allow more sunlight to reach your skin, leading to a more even tan. With BetterTan Swimwear, the mesh-like micro perforations are intended to allow tanning, but the overall effectiveness is questionable based on user reviews.