1. Please measure the size of your sofa before ordering. 2. Please measure according to the red line marked on the figure and then select the corresponding sofa cover according to the measurement result. 3. 1-seat sofa need to measure the red line AA, if the size you measured is between 90cm and 140cm，you can choose to buy a sofa cover for 1-seat. 3. If your sofa is a combination sofa, as shown in the third figure, you need to choose the sofa cover of the corresponding size according to the measured two size AA and BB respectively. 4. If your sofa is the same as the fourth picture,you need to measure AA, BB, and CC respectively, and then select the sofa cover of corresponding size.