The Difference Between French Wig Lace and Thin Skin Foundation Obviously, you’ve experienced countless closures and hair systems constructed with French lace. It’s possible you have noticed, or even encountered wigs and hairpieces made of thin skin foundation. Both products seem impressive, but just what is the major difference between French lace and thin skin wig foundation? The most frequently used foundations are French lace and super thin skin. Each wig cap foundation w