Hi Seven .. really as wearers, I wouldn`t `worry` too much about the really technical things such as in this case of how the factory actually fabricates systems....what way the hair is `anchored`to a particular base really isn`t a major issue as such in relation to appearance or styling, but it can have a bearing on things like shedding .... I`ve worn all -poly systems in the past and can`t really say I found any appreciable difference in how it looked compared to my present one [ Swiss lace with a small poly strip ] The hairs are injected into poly compared to being tied in knots into lace...some people will tell you that that can cause a `style -issue` [having the two materials with 2 different hair attachment methods combined on 1 system] but I `ve never noticed any problems...... without being `smart`with anyone now [as I totally respect everyone`s point of view/experiences ] I wouldn`t even consider what way they attach the hairs into a given system ...as long as it`s fit for purpose when it`s on my head, looks good and lasts a good amount of time..... I`m a happy bunny !! I`m no expert but I guess, if hairs are tied into knots,rather than just `looped`into some base material, there `s less chance of hairs coming free/shedding, especially when sealed with Knot-sealer. I`m totally open to differing view-points though, as a matter of interest. Regards, Paul.