hmm interesting. I am not sure if I just am lucky or people are very particular. I never really had much of an issue with knots at the hairline. If there are knots visible they are so tiny and non noticeable it doesn't even bother me. I haven't tried Toplaces skin system yet, but ones I have tried from other places weren't that great. The ventilation doesn't seem as good on skin, V-loop. I would like to hear how you like toplaces skin pieces. Hope you keep us posted.