What is the pocket in women's underwear for?
The "pocket" is the gusset: a second layer of fabric, usually cotton, sewn into the crotch of the underwear to line the part that sits against the most sensitive skin. It looks like a pocket because the lining is usually stitched at the front and along both leg edges, but left open at one end, most often the back.
It is not meant for storing anything. Leaving one end open avoids an extra seam across the most sensitive area, lets air move through the lining, and makes the underwear quicker to sew. The gusset itself is there for breathability, absorbency and comfort.
When you buy underwear, the gusset is the part to check first. Whatever the outside is made of, the gusset should be soft, breathable and, for most people, cotton.
Turn almost any pair of underwear inside out and you will find it: a small panel in the crotch, sewn down on three sides and open on the fourth. People have guessed it is for money, keys, pantyliners or nothing at all.
Here is what that pocket really is, why it is left open, what it is not for, and why it is the most important part of any pair you buy.
- The pocket is the gusset lining, a second layer in the crotch.
- It is open at one end to avoid an extra seam, help airflow and simplify sewing.
- It is not for storage or for holding pantyliners.
- Cotton is the standard gusset fabric for breathability and absorbency.
- Check the gusset first when buying lace, sheer or microfiber underwear.
What the Pocket Actually Is
The pocket is the inside layer of the gusset, the panel that lines the crotch.
Most underwear is made from three main pieces: a front panel, a back panel and a narrow panel between them in the crotch, called the gusset. The gusset is usually two layers thick. The outer layer often matches the rest of the underwear, while the inner layer, the lining, is usually cotton or a cotton blend, because that is the part that sits against the most sensitive skin.
The "pocket" appears because of how that lining is attached. It is usually stitched across the front seam, and its long sides are caught in the leg elastic along with the outer layer. The back end is often left unattached, so you can slip a finger between the two layers. On some underwear the open end is at the front instead, and on some the lining is stitched all the way round, so there is no pocket at all.
Why the Gusset Is Left Open
There is no single official reason, but three practical ones explain it.
None of these changes how the underwear works. A gusset that is stitched closed on all sides does the same job; it just has one more seam. What matters is the fabric and the fit, not whether you can find the pocket. Our cotton underwear guide explains why the gusset is the part that does the real work.
What the Pocket Is Not For
A few theories come up again and again. None of them is what the pocket is designed for.
Some travel and sports underwear has a deliberate, zipped or flapped pocket for a key or card. Those are designed for it and sit at the waistband or hip, not in the gusset.
What the Gusset Should Be Made Of
The outer fabric can be anything. The lining is where the fabric choice really matters.
| Gusset lining | Good for | Notes |
|---|---|---|
| Cotton | Everyday wear, sensitive skin | Breathable and absorbent; the standard choice |
| Cotton with spandex | Everyday wear | Keeps its shape; still cotton against you |
| Pima or Supima cotton | Softness | Longer fibers, smoother feel |
| Modal | Softness | Very soft; less durable over many washes |
| Microfiber | Seamless styles | Smooth but less breathable than cotton |
| Silk | Luxury pieces | Smooth and gentle; hand-wash |
Cotton is the standard recommendation for the gusset because it breathes, absorbs moisture and washes well. That is why even lace, satin and microfiber underwear usually has a cotton lining in the crotch. If you have sensitive skin or are prone to irritation, a cotton gusset is the first thing to look for; our guide to underwear for sensitive skin covers the other details that matter.
The Gusset Across Different Styles
Every style has one, though it looks different in each.
Briefs and boyshorts have the widest, longest gussets, which is one reason they feel so comfortable. Bikinis and hipsters have a slightly narrower one. Thongs have a gusset too: a short panel at the front of the crotch before the fabric narrows into the back strap. In a good thong, that panel is cotton-lined and wide enough to be comfortable. Our thongs guide covers how to tell a comfortable one.
Lace and sheer underwear rely on the gusset more than any other style, because the outer fabric is decorative and often scratchy. A cotton lining makes them wearable all day. Shapewear often has an open or hook-and-eye gusset so you do not have to take it off to use the bathroom, which is a different thing entirely. Period underwear replaces the simple lining with an absorbent, layered panel; our guide to period panties explains how those layers work.
What to Check When You Buy Underwear
Turn the underwear over before you look at anything else.
In lace and sheer styles, check that the gusset lining is not just a narrow strip. In seamless and bonded underwear, check whether the gusset is cotton or the same microfiber as the rest; both are fine, but cotton breathes better for everyday wear. Our guide to women's underwear covers the rest of the fit checks, from rise to leg openings.
Our Picks With Cotton Gussets
Comfortable everyday styles where the crotch lining is clearly cotton.
For more choice, browse cotton panties, cotton thongs and all panties. For lace and sheer styles, check each product page for the gusset fabric.
Caring for the Gusset
The lining takes the most wear, so it decides when a pair needs replacing.
Wash underwear after every wear. Turning it inside out before washing helps the water and detergent reach the lining directly. Use a mild, fragrance-free detergent if your skin is sensitive, and skip fabric softener, which coats cotton and makes it less absorbent. Cotton underwear can usually be washed warm; lace, silk and microfiber do better cool and in a mesh bag.
Replace underwear when the gusset thins, pills, stains permanently or the stitching starts to come loose, even if the rest of the pair still looks fine. Our cotton underwear guide covers how long a pair should last and how the elastic usually fails first.
What This Means for You
The pocket in women's underwear is the gusset lining: a second layer, usually cotton, stitched at the front and sides and often left open at one end. It is open to avoid an extra seam, help airflow and simplify sewing, not to hold anything.
The gusset is the most important part of any pair you buy. Check that it is cotton or clearly labeled, wide and long enough, and soft at the seams, especially in lace and sheer styles, and replace underwear when the lining wears thin.
Cotton Underwear, Sensitive Skin and Every Style
How to choose underwear that is comfortable all day.
Cotton UnderwearSensitive SkinWomen's UnderwearFrequently Asked Questions
What is the pocket in women's underwear for?
Why is there a hole in the crotch of my underwear?
Should a pantyliner go inside the gusset pocket?
Why is the gusset made of cotton?
Do thongs have a gusset?
Why do some of my underwear have no pocket?
This guide is for general information about underwear construction and care. Gusset construction and fabric vary between brands, so check the product details for each item. If you have persistent irritation or other symptoms, see a doctor.
