POLYFOND KIT is a protective and drainage system made from high-density extruded polyethylene (HDPE). It is particularly effective in protecting the waterproofing of below grade structures or of earth retaining structures in general. The new HDPE blend, the new structure and the new star-shaped stud geometry give POLYFOND KIT extremely high mechanical performance, ensuring perfect ventilation and excellent water drainage. In addition, POLYFOND KIT is designed to provide the waterproofing membrane with suitable protection during foundation backfilling work.