Top Notch | Synthetic Hair Topper (Double Mono Top)One of my favorites: The Top Notch by Jon Renau is a mid length top piece (hair topper) with a double monofilament base. Worn on the crown, this top piece integrates with your own hair to add body and give you total styling flexibility. The hair is 8 10 inches in length. The double monofilament top provides multi directional styling and looks like natural hair growth. The extra layer of monofilament makes it smooth, soft and comfortable on the scalp.