The poly is only an inch wide---you can have it less if you wish......I find it suits me, you might prefer all-lace, it`s just a personal thing. I`d advise you not to wear for longer than 10 days really...less if you live in a hot climate, or [as you say] your scalp sweats a lot, due to glue/tapes degenerating and becoming messy for your clean-up.[see the recent post by Antywanty on his issues] Some wearers can `get away with it`but most can`t.....you need regular cleaning of your scalp etc.... finally, the poly will probably last longer than the lace itself so it`s not a case of ``the piece lasting longer with a poly strip`` ---you`re combining two materials so they will not necessarily age/wear at the same rate..... regards, Paul.