A layer has a base body made of nonwoven material, the base body comprising fibers and first pores formed by said fibers, the base body being partially filled with particles and said particles at least partially filling the first pores and forming regions filled with particles. The aim of the invention is to structure and refine such a layer such that, after a cost-effective production, said layer has a low thickness, high porosity, and high temperature stability. Said layer is characterized in that the particles in the filled regions form second pores, wherein the average diameter of the particles is greater than the average pore size of the majority of the second pores.