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A pantyliner (also pantiliner, panty liner or panty shield) is an absorbent piece of material used for feminine hygiene. It is worn in the gusset of a woman's panties. Some uses include: absorbency for daily vaginal discharge, light menstrual flow, tampon and menstrual cup backup, spotting, post-intercourse discharge and urinary incontinence.
Pantyliners are related to sanitary napkins in their basic construction - but are usually much thinner and often narrower than pads. As a result they absorb much less liquid than pads - making them ideal for light discharge and everyday cleanliness. They are generally unsuitable for menstruation of medium to heavy flow, which require them to be changed more often.
Pantyliners are found in an assortment of sizes, shapes, scents and portability options, ranging from tiny, compact liners to long, protective liners designed for heavy vaginal discharge and light days (light menstrual flow). There are even styles designed to fit with thong underwear.
Disposable pantyliners are made with a sticky adhesive on the back of the pad to hold them in place in the panties, and some styles have 'wings' which wrap around the panties, providing additional stability.
Reusable cloth pantyliners come in a variety of sizes, materials, patterns, colors, and absorbencies, and are usually secured to the underwear by wrap-around wings that snap together at the ends. These are made of cotton (often organic), and can be washed and reused for years. See cloth menstrual pad for more information.