Described is an insect screening sheet having an insect-repellent layer in which the insect-repellent layer has a three-dimensional surface structure which comprises a regularly periodically andor statistically distributed coarse structure andor nanostructure. The heel cushioning system includes a sole, a curved plate and tread members. Then, the second gravure-printing step is performed such that a second print mark is printed at a suitable position with respect to the position of the first print mark. One particularly advantageous embodiment is that the starting material is non-viable pre-embryos.