T-front thong is a type of women's underwear or swimsuit with a string extended to its front. It does not cover anything, but maintains the basic hygienic function of underwear. The T-front cut originates from traditional clothing of ancient human cultures, where a narrow string between labia protected the most sensitive and unprotected parts of women's bodies. Modern T-front thongs are usually sewn only from strings or cords, or using an elastic fabric or lace around the waist. They are mostly designed as minimalistic underwear, but some companies also produce swimwear in a T-front design.

From a health point of view, T-fronts bring a significant reduction of risk of restricting blood and lymph circulation in the vessels in groin area - in contrast to classic tighter cuts of bikinis or thongs. When wearing T-front panties, there is also no irritation of sensitive areas during activities where the legs perform rhythmic movements in the opposite direction, e.g. when walking or running.

The T-front cut of the front part is used for panties of many types.

High-waisted T-fronts