Skin Hair System offers the most realistic hairline appearance because it is made of polyurethane, very thin skin PU material without knots makes it very natural, it seems like your own scalp, at the same time, it has less hair on the base to make it super light to wear. Skin toupee is easy to clean and attach. 2. Lace Hair System is the most comfortable toupee for men. It's very soft and breathable.(Swiss lace & french lace) It's suitable for hot weather or people who work with a lot of exercise. It won't hurt your skin on the top of your head. The bleached knot is used at the front of the base to keep your real hairline. 3. Mono Hair System has the most durable base which is breathable and strong. It can carry a large density of hair, so it is heavier than the two systems above. Mono Lace Toupee has longer lifespan than other bases. It is usually combined with a large area of NPU around the primeter to ensure that it adheres firmly and creats an invisible hairline.