A preform for producing containers having a neck section, a wall section and a bottom section, which is a multilayer structure having three layers, one of which (1) is directly inwardly respective the preform and is composed of a primary material (PM) thereby forming a primary basis layer (1). The primary material is a synthetic material. A further layer (3) is directed outwardly with respect to said primary layer (1), in such a way that it forms the outer surface layer (3) of the preform, thereby made of a tertiary material (TM) forming a tertiary surface layer (3). The tertiary layer is composed of a further synthetic material. In the preform, an intermediate layer (2) is provided between the primary and tertiary layers (1, 3) which is composed of a secondary material (SM) consisting of a fluid. Also disclosed is a process for manufacturing the preform.