A monofilament (mono) wig has a cap that is made in such a way that gives the appearance of a natural scalp at the crown. Monofilament caps are made of a thin mesh-like material. Hairs are individually hand tied at the crown, which gives an extremely realistic look. Monofilament wigs lay much flatter than standard wig caps because there is no machine teasing at the crown. 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.