The material sleeves are made of is extremely important because it comes into direct contact with the playing surface and the printed surface of the DVD. Sliding a DVD out of a DVD storage sleeve rubs the disc surfaces against the sleeve material and can leave micro scratches on the DVD. Micro scratches can impair the quality of the play back and worst case make the DVD unplayable.
State of the art quality sleeves use non-woven fabrics made from inert materials like polypropylene. An example of an archival quality storage solution are the DVD Storage Sleeves from DiscSox.
The playing surface of the DVD is not the only part that needs protection. Certain chemicals found in materials like vinyl can dissolve the print on the DVD and make the surface sticky. In some cases these chemicals eat through the polycarbonate of the disc and can distroy the DVD. So for archiving DVDs inert materials without added chemicals are required.
The most effective solution is non-woven polypropylene fabric to protect the playing surface and matte transparent polypropylene for showing the graphics or printed side of the disc. This material combination is used in protective archival quality sleeves.