Women’s underwear often includes a small, unnoticed feature: an extra piece of fabric sewn into the crotch area. While some have jokingly called it a “secret pocket” for tampons or lipstick, its real purpose is far more practical.

This extra layer is called a gusset, and it’s designed for hygiene and comfort. Unlike the rest of the underwear—often made from lace, satin, or synthetic materials—the gusset is typically cotton. Cotton is breathable and absorbent, making it ideal for protecting sensitive areas from moisture, irritation, and bacterial growth.

By allowing airflow and wicking away moisture, the gusset helps reduce the risk of infections and promotes all-day comfort. It’s a small but essential detail in underwear design that supports women’s health.

Not all underwear styles include gussets—some fashion-focused lingerie skips this feature—but most everyday underwear includes one for good reason.

So, the next time you notice that little fabric panel, know it’s not a mystery pocket. It’s a smart, thoughtful addition built for comfort, hygiene, and daily protection.