The fit of your wig in an essential component to the overall look  and feel of your hair piece and often determines how natural it will look. Ensure accuracy with your measurements,  we recommend measuring several times. Considering that over time your wig cap will stretch and adjustments will be necessary. As a general rule of thumb, if you are in between sizes size down. In most cases, if the front to back and ear to ear are slightly snug, with daily use the circumference will stretch.