Lace size is the first number on every wig product page and the one buyers understand least. It is not a quality rating. It is a measurement of the lace panel in inches — width by depth — and it determines exactly one thing: where you can part your hair.
The measurements
| Type | Lace size | Parting space | Typical price |
|---|---|---|---|
| Closure | 4x4 or 5x5 inches | Middle, or slightly off-centre | Lowest |
| Frontal | 13x4 inches | Anywhere across the front, 4" deep | Middle |
| Full frontal | 13x6 inches | Anywhere across the front, 6" deep | Highest |
The first number is width, ear to ear. The second is depth, how far back from the hairline the lace runs before the wefts start.
The two-inch problem
Here is the thing nobody explains clearly. When you part hair on a wig, you can only part where there is lace — because lace is what simulates scalp. Past the lace, you hit wefts: rows of sewn hair with a visible hard line.
On a 13x4, you have four inches of depth. Part in the middle and that is plenty; the part travels straight back and four inches is further than anyone can see. But part deeply to one side, and the part travels diagonally. A deep side part covers more distance across the lace panel, and on a 13x4 it can run out of lace about an inch and a half back. That abrupt stop, where the part suddenly ends in a line of wefts, is the single most common way a wig gets clocked.
A 13x6 adds two inches of depth for exactly that reason. Not for width — both are thirteen inches ear to ear — but for the diagonal.
Who should buy what
Buy a 4x4 or 5x5 closure if you part in the middle, every day, and always will. You will get the same grade of hair and lace for meaningfully less money, with a faster install and less lace to cut, tint and maintain. A closure is the most under-rated purchase in wigs: a lot of people pay a frontal premium for parting freedom they never use. Choose 5x5 over 4x4 if you occasionally shift the part off-centre.
Buy a 13x4 if you switch between a middle part and a moderate side part, want to pull the front back sometimes, or simply want options. This is the right answer for most people most of the time and it is why it is the industry's default.
Buy a 13x6 if you wear a deep side part, a half-up style, or push your hair back off the face. If you have owned 13x4 units and felt limited by them, this is the specific limitation you were running into.
What lace size does not tell you
It says nothing about lace quality. A 13x6 in cheap, thick Swiss lace looks worse than a 4x4 in genuine HD lace. Quality is about gauge and transparency — HD lace is finer and disappears against skin without tinting. Check the lace grade separately from the size, and be sceptical of sellers who use "HD" to describe ordinary transparent lace.
It says nothing about density. A 13x6 at 130% still looks thin. Density is a separate decision; see our size and density guide.
It says nothing about how hard the install is. More lace is more to cut and lay down, so a 13x6 is marginally harder than a closure — but all three are trivial if you buy glueless and skip the cutting entirely.
The short version
Part in the middle? Buy a closure and put the savings into density or length. Want flexibility? Buy a 13x4. Part deep, or wear it back? Buy a 13x6.
Shop closure wigs, 13x4 HD lace fronts, or 13x6 full frontals.