All clients like toupees without knots. They do not want a toupee that looks like a toupee. The knots make the toupee look artificial, making knotless toupees very popular.
Injected thin skin and V-looped thin skin toupees are all knotless toupees which look very natural. The thinnest thickness of the thin skin with V-looped hair is 0.03mm, making it very fine. Please see the picture of V-looped 0.03mm thin skin (HS25) below. The life span of the HS25 (ultra thin skin of 0.03mm) is very short (only 1-2 month). If you want it to be more durable, you can order the skin a little bit thicker.