Godiva's Secret Wigs offers petite wigs in a variety of chic and modern styles and color blends. Our Petite Wigs range from 18" to 21" in circumference size. The exact size of each wig can be found in it's Product Description. To measure the circumference of your head, simply take a tape measure and place it at the middle of your forehead at the hairline. Then run the tape around the head, behind one ear, around the nape of the neck, behind the other ear, and then back to the front at the hairline. As a side note, as you look through our wigs, note that Short Wig, Medium Wig and Long Wig refer to the hair LENGTH of the wig. Petite, Average and Large refer to the cap SIZE of the wig. "LF" stands for Lace Front and "Mono" stands for Monofilament Top.