Invisible Line Collection. It's not just a wig, it's like your own hair with an untraceable hair line and an extra thin lace top! The most comfortable and fitting cap ever made with the patent pending "Pure Strecht Cap", which strecthes throughout the entire perimeter of the cap. No tightness like all the traditional wigs, even when wearing constantly for several days! 10" Classic Bob W/ Layered Feather Tip. Lace Front Wig.