The hair foundation is almost invisible, and with their tab material to hide the foundation and adhere it to the scalp, no one will notice,
The ventillating process can begin about 1/16 of an inch from the front of the foundation.
If you maintain your hair piece keeping it flat and slightly stretched ,
then when you attach it it lays flat, and is unseen.
It is impressive to see the hair apparently coming out of the scalp, very professional
But for the noob, it will take a few wigs before you are familiar with the cements.
The other method is to simply ventelate the hair so it falls forward , covering up the foundation material. This works quite well. You can pull your wig out of the laundry basket and it will look good.