What is a lace front wig or full lace wig?
Here is a good article about lace front wigs / full lace wig. They have pic and video on how the are made http://www.pinklacewigs.com/What-are-Lace-Wigs_ep_29.html
A hairpiece or full wig which is made with a mesh like lace insert in the front or all around (for pony tails) or full system into which individual hairs are hand-tied. This is designed to create a realistic looking hairline. The lace is trimmed to match the skin after purchase so that only a part that looks comfortable and more realistic to the client is left. When properly worn with special adhesive, the hairline can be so realistic looking as to be virtually undetectable that it is not the wearer’s own growing hair. It resembles a lot of the wigs that we see on models on the runways as well as famous actresses.