A method for manufacturing a protection device includes the steps of forming a plurality of cells in a support strip, filling the cells with a non-cross-linked compound, cross-linking the compound to form at least one module made of viscoelastic gel in the plurality of cells, depositing an adhesive substance on each module, and depositing a strip of fabric on the support strip to obtain a final compound strip. The at least one module made of viscoelastic gel is glued onto the strip of fabric by the adhesive substance.