Base size : width x lengthToupees have sizes of 6x8, 7x8, 7x9, 8x10 and other sizes. So you need to confirm the length and width of your hair loss area.First, find your front hairline.Normally it is four fingers width away from your eyebrow.Please place your 4 fingers onto your forehead and one side lines up with your eyebrow and the other side should be where your front hairline begins.Second, confirm the lengthMeasure from your front hairline to where your hair loss stops at the back of your head.Third, confirm the widthMeasure the widest area of your hair loss area from one side to the other.