1.How to Attach a Lace Wig? (1)Prep your hair, by creating a flat surface for the wig to sit on. You can braid your hair down, or apply a wig liner. (2) Fit the wig on your head, and evaluate how and where you would like the hairline. The goal is to find where the hairline will look most natural. (3 Gradually starting trimming the excess lace, the goal here is to create your hairline, only cut small amounts off at a time. (4)After you have created your hairline, apply adhesive to the hairline, so it can stay on your head. (5)The finished hairline should look totally natural, as if the hair were actually growing from your head 2.Cap Size ItemSmall(Inch)Medium(Inch)large(Inch)around the head21-21.7522-22.7523-23.5front to nape13.5-1414-14.2515-15.5ear to earover the top of the head11.75-1212.5-12.7513-13.50nape4.55-5.255.5-6