Almost every complaint about wig length is really a complaint about shrinkage. The unit is the length it says on the listing. It just does not look it, because length is measured on hair pulled straight and you are wearing it curly.
This guide gives you the shrinkage figures by texture, shows you where each length actually lands on a body, and tells you how to convert the length you want into the length you order.
How wig length is measured
Every reputable seller measures the same way: a single strand is pulled straight from the cap to the tip and measured against a tape. That is the stated length. It is not a measurement of the hair as it hangs.
So a 20 inch deep wave unit genuinely contains 20 inch hair. Stretch a strand and the tape will say 20. Let it go, and the curl pattern pulls that same strand back up into itself, and what you see in the mirror is closer to 14 or 15 inches of visible length.
Nobody is being dishonest. Measuring stretched is the only method that gives a consistent number across textures — measuring as-worn would mean the same hair had a different length depending on how it had been styled that morning.
Shrinkage by texture
The tighter the curl, the more of the length disappears into the pattern. These are the ranges we see across human hair units:
| Texture | Shrinkage | 20" looks like |
|---|---|---|
| Straight | 0% | 20" |
| Kinky straight | 5–10% | 18–19" |
| Body wave | 10–15% | 17–18" |
| Loose / deep wave | 20–25% | 15–16" |
| Water wave | 25% | 15" |
| Curly | 25–30% | 14–15" |
| Kinky curly | 30–40% | 12–14" |
Two things shift these numbers. Humidity tightens a pattern, so the same unit reads shorter in a wet climate than a dry one. And density adds visual weight that drags a curl down slightly, so a 200% curly unit hangs a touch longer than a 150% one in the same length.
Where each length lands
Length only means something relative to a body. On an average frame, measuring from the hairline with the unit worn:
- 10–12 inches — chin to jaw. Bob territory. See the bob length guide for where the cut line should sit.
- 14–16 inches — collarbone. The most-worn range because it clears a coat collar.
- 18–20 inches — mid-chest.
- 22–24 inches — below the bust, approaching the waist.
- 26 inches and up — waist and past it. Needs density behind it or the ends read stringy.
Height moves all of this. If you are under 160cm, every length lands roughly one size longer on you than the list suggests; over 175cm, one size shorter.
Converting the length you want into the length you order
Work backwards. Decide where you want the hair to finish, find that length in the list above, then add the shrinkage for your texture.
Worked example. You want a deep wave unit finishing at your collarbone, which is about 16 inches of visible hair. Deep wave shrinks 20–25%. Divide 16 by 0.78 and you get roughly 20. Order the 20 inch.
A second example. You want curly hair sitting at mid-chest, about 18 inches visible. Curly shrinks 25–30%. Divide 18 by 0.72 and you land near 25, so order a 24 and accept it will sit a shade higher, or a 26 if you would rather cut than wish.
The rule of thumb, if you do not want to do arithmetic: add four inches for wave, six for curly, eight for kinky curly.
Density has to rise with length
Long hair that is not dense enough looks thin rather than long, because the same amount of hair is spread over more distance. Past 22 inches we would not go below 180%, and past 26 inches 200% is the sensible floor. Our density guide explains what those percentages look like on a real head, and the size and density page sets out what we stock in each.
Can you stretch the length back out?
Temporarily, yes. Blow-drying on a low setting with a brush, or a flat iron on 150–180°C with heat protectant, will pull a wave or curl close to its stretched length. It is the same hair, so it measures what the listing said.
Two warnings. The pattern comes back the moment the hair gets damp, so a straightened curly unit is a dry-weather commitment. And repeated heat is what eventually kills a curl pattern permanently — once it stops reverting after a wash, it is not coming back. If you want straight hair most days, buy straight hair: our straight collection exists for exactly that, and Eden holds a sleek finish with far less heat than a straightened curly unit needs.
What shrinkage is not
If a unit measures short when you stretch a strand, that is not shrinkage — that is a short unit, and it should go back. Pull one strand from the nape taut against a tape measure before you wear it. If a 20 inch unit measures 17 stretched, our returns policy covers it as long as the unit has not been installed or altered.
Shedding can also fake shrinkage over time, as the longest strands go first and the silhouette creeps upward. That is a different problem with a different fix — the shedding guide covers it.
Where to start
If you are buying a textured unit for the first time, go one length longer than feels right. Nobody has ever regretted being able to cut. Sienna runs 18 to 26 inches in loose deep wave, and the wider curly and wavy collection lists stretched length on every unit so you can do the conversion before you buy. If you are still deciding on texture at all, the texture guide is the place to start.