This is an example of a Jon Renau Lace Front / Monofilament wig. Not all such wigs are made exactly this way, but they are all similar. This is to give you a general idea of what to expect. Please note that front seam; this is something you'll find in all LF+MT wigs.
Also note that some of these styles will also incorporate permatease in the caps, usually right behind the crown, to give the wig a little lift and to prevent the wig from flattening out. This is most likely to be seen in wigs that are heavier than 4 ounces, or ones that fall below the shoulders.