What a hijab cap does
A hijab cap, also called an underscarf, inner cap or bonnet, is a close-fitting layer worn beneath a hijab. It does three jobs. It holds hair in place, it gives a slippery outer scarf something to grip, and it gives a sheer outer scarf an opaque base. Many wearers own several in different colors, because a cap that shows at the forehead or neck is often matched to the hijab worn over it.
How and whether someone uses a cap varies between people. Some wear one under every hijab; others use one only with chiffon or satin; some prefer a jersey hijab that grips on its own. A product page should describe what each cap does and let the customer decide.
The main types
| Type | Construction | Fit | Good for |
|---|---|---|---|
| Tube cap | Stretch tube, open at the top or gathered, no ties | Set by fabric stretch | Quick everyday wear, beginners |
| Tie-back cap | Front band with long ties knotted at the back | Adjustable | Varied head sizes, hair worn up in a bun |
| Bonnet | Shaped crown with an elastic or banded edge | Elastic | Holding hair fully enclosed |
| Full-coverage cap (ninja style) | Cap with an attached panel that covers the neck | Stretch, sometimes with an opening at the back | Wraps that leave the neck exposed, sport |
| Cap with bun volume | Cap with a padded or extra-fabric section at the back | Stretch or ties | Customers who prefer volume at the back of the hijab |
Tube caps
The simplest and usually the fastest-selling type. A tube of stretch jersey is pulled over the head and pushed back to the hairline. Some are a plain tube; others are gathered or sewn at one end to form a closed crown. Tube caps rely entirely on fabric stretch and recovery, so the fabric choice and the cut width decide whether they feel secure or tight. They are the basis of the al-amira style, which pairs a cap with a tube scarf; see al-amira hijabs.
Tie-back caps
A band of fabric crosses the forehead, with long ties that pass under the hair at the back and knot. Because the wearer controls the tension, tie-back caps fit a wider range of head sizes and hairstyles. They are popular with customers who wear their hair in a bun. The ties need to be long enough to knot comfortably and finished so they do not fray.
Bonnets
A bonnet has a shaped crown, often from two or more panels, with an elastic or banded edge. It encloses hair completely. The word bonnet is used loosely in listings, and some sellers use it for any cap, so describe the construction rather than relying on the name.
Full-coverage or ninja caps
A full-coverage cap adds a panel that covers the neck and sometimes the upper chest, so the outer hijab can be wrapped more loosely without leaving the neck exposed. Ninja cap is a widely used trade name for this style. Many stores now prefer a descriptive name such as full-coverage underscarf or cap with neck cover, which is clearer and more respectful; you can mention the trade name in the description for search.
Fabrics
Almost all hijab caps are knit, because stretch and grip are what the cap is for.
- Cotton jersey. Breathable, matte and soft. Grip is good; recovery is moderate, so tube caps in pure cotton can loosen during the day.
- Cotton-spandex. Cotton with elastane for stretch and recovery. Holds its shape and grip well, and is a common choice for tube and full-coverage caps.
- Viscose jersey. Very soft with a fluid feel, cool to wear. Check shrinkage on the spec sheet.
- Viscose from bamboo. A soft jersey; on US labels it is written as viscose or rayon from bamboo, not as bamboo.
- Performance knit. For sports caps, where moisture handling matters more than a cotton feel.
Some caps add a strip of textured or silicone-backed fabric at the forehead for extra grip. Weight is confirmed on the spec sheet rather than described with a number on the product page. The jersey hijab page explains how knit weight affects opacity and grip.
Sizing and fit
Caps are sized by head circumference and by fabric stretch. Most adult caps are sold in one size, with the stretch range written in the description; some ranges add a small and a large, and kids' caps are sized by age range. The common fit complaints are predictable: a cap that slips back off the hairline, a cap that presses at the temples, and a full-coverage cap whose neck panel rides up. Each one comes from a measurement, so the spec sheet records the cap circumference relaxed and stretched, the depth from forehead to crown, and for full-coverage styles the neck panel length.
Colors
Caps sell mostly in neutrals: black, white, off-white, nude and skin-tone shades in several depths, navy, grey and brown. Because the cap often shows a narrow band at the forehead, many customers match it to the hijab, so stores that carry many hijab colors often carry caps in the same palette. Matching a jersey cap to a chiffon hijab is not automatic; the two fabrics take dye differently. Lab dips on both fabrics together give a better match than matching one after the other.
For sellers: naming and describing caps
Lead with the construction and the function, then the fabric. Tube cap in cotton-spandex jersey, or tie-back underscarf with long ties, tells the customer more than a name alone.
- Type. Tube, tie-back, bonnet or full-coverage, with a sentence on how it is put on.
- Fit. Head circumference range and stretch, in centimeters and inches.
- Fabric. Fiber content as on the label, and whether it grips.
- Color match. Which hijabs in your range it matches, if any.
- Care. As on the care label.
Use descriptive names where a trade name may read awkwardly, and keep the trade name in the text for search. Photograph caps on a form, without faces. For sourcing, the underscarves and caps page covers constructions and finishes, and the sample request form starts a written quote with minimums confirmed for your program.