Bobi Open Back Sweater in Gray. - size L (also in ) Bobi Open Back Sweater in Gray. - size L (also in ) 50% rayon 46% poly 4% spandex. Heathered knit fabric. Draped back. Stretch fit. BOBI-WK69. 547 21518. Bobi is an LA-based line of dresses and tees made from some of the highest quality jersey at an affordable price.