Looks like Swiss lace to me, the sides seem like they are not glued perfectly (the lace is shining through). The knots are bleached well.
I think the problem about this hair piece is, that there is excess lace in the front region and he should add some grey hairs to make it look more realistic (he probably wants to look younger than he is).

Toplace systems are definitely on par. Travolta's toupet is probably the same as a TL 100 or TL500.