Pleaes carefully select between Box Edge or Knife Edge. It fits Pottery Barn's PB Comfort Roll ARM Sofa (Width: 81”~ 83.5”). Warning: It does not fit Comfort loveseat (Width: 67”), nor fits Grand Sofa (WIdth: 92”). It doesnt fit Comfort Square Arm Sofa!. We only use high quality cotton material for this sofa cover, and we run a number of tests to make sure that our cover fits well. The package includes one set of sofa covers. Warning: Sofa is not included! Washing Instruction: Please use air dry, spin dry or dry cleaning in case if you need to wash it.