When selecting a hair topper, determining the needed coverage area is crucial. Wearing a base of the right size ensures a natural look and comfortable feel. To determine how much coverage area you need, first identify the area of hair loss, whether it's localized, at the crown, at the hairline, or across the entire hairline. Use a fabric tape measure to record the widest point of hair loss from front to back and side to side. You can use a mirror or seek assistance for the best results. Add an inch to each measurement to leave extra hair on the sides for comfortable clip attachment. Ensure the area you intend to clip the hair topper onto is healthy hair that can support the weight of the topper. If your crown and top are thin, a larger coverage area topper works well. Here, we recommend our 13*13cm and 6*7inch toppers. Both have larger base sizes to instantly add volume. You can order either one based on your budget.