... hair, it has most natural looking hairline. Super thin skin base, one of the newest materials ... : French lace, Swiss lace, Fine mono, Light monofilament, Thin skin PU or French knoting. 3. Base size ... revert knots, new revert knots. 5. Hair density: Light, medium, heavy density(80%-150%). 6. Bleach knots ... Base color: Clear, flesh, black, brown, light brown, yellow or any color you prefer. Double ...