Styrene resin films having been imparted antistatic properties to both film surfaces and good adhesion properties of the films to envelope paper, and a process for producing the same. The sole has a heel section for supporting a heel of the foot. This is ensured by means of a folding aid, namely by edge supports, around which the folding flaps are folded to form the package edges. Each of the plurality of trigger generators is associated with a corresponding timeout threshold value representing the minimum amount of time that must elapse for the trigger generator to generate a timeout event trigger. A three-dimensional pattern in the fibrous material results in a camouflage fabric with enhanced realism due to ability of the fabric to transmit varying amounts of direct and incidental light, thus producing shape-obscuring shadows.