After a total of 3 years, in which the cases had to be bought Leifheit every year, we have this year decided to switch suppliers. - Leifheit neither responded to our complaints, nor anything changed on the substance of the cases. This current material just is not weatherproof. Leifheit returns the old scrap continues! Mind you at a princely sum.! Now came the ordered at Amazon oa shell: Best - with metal zipper and a material made of polyethylene, with a thickness that can withstand wind and weather. Now we finally have certainly rest with the cover and their problems.