I'm always surprised these are not more popular. They're great if you have an office job, where you might have people standing behind you looking over your shoulder, because the scalp looks 100% natural from the top. They are at least as durable as single ply lace - I get 5 or 6 months out of mine, and it is usually the front that goes first, not the "island". The only downside is they are slightly warmer than a single ply base.

I would use thinskin rather than poly for the perimeter though. It is less detectable to touch and there's less chance of it being visible, especially if your hair gets drenched with sweat or rain.