Mooradian Black Oblong Slip-On 4/4 Violin Case Cover with Padded Back-Pack Straps Water resistant polyester fabric exterior. 1/2" foam padding. Spacious document pocket and padded back-pack straps. This high quality cover fits tightly over your existing 4/4 oblong violin case to give excellent thermal and shock protection in all weather! Made in the USA by Mooradian, THE leader is instrument case covers.