BT Ultimate Plus Monofilament Top Wigs - Mono-Top Wefted Sides and Back Individually hand-tied top and front in a single layer monofilament mesh top which allows natural skin tone to appear through. It is both water and air permeable. Hand-tied underventing around entire front hairline. Thin see-through polyurethane. Entire cap is made for complete comfort with soft edges. Tape tab area in front and in back. Adjustable Velcro Tabs for a custom fit. Stretch ribbon allows for an even better custom fit.