Single Knotted On PolySingle knot is the common knot method on polyurethane, it is stronger and more durable than V-loop.
Double Knotted On Lace/mono
Double knot is a kind of strong knot type, it is used on entire lace and mono except front hairline. Hair is single hair single knotted at hairline on lace system.
Hair V-looped On Poly
v-loop means that hair goes through like a letter "V", only 1mm hair shaft is coated in the poly base, there is no visible knots, it creates natural appearance that it looks like hair grows out of scalp directly.
F-Injected On Poly
Hair root is injected and coated into poly base without knots or return.
S-Injected On Poly
Hair root is injected and coated into poly base without knots or return, hair stands well, the angle to the base is big, which is more natural.
French Part / Silk Top