What is the gusset of underwear for?

The gusset of underwear is the piece of material that is sewn into the crotch area of certain types of undergarments. Its purpose is to provide extra support and comfort for the wearer, as well as prevent chafing and irritation. The gusset is typically made from a breathable and absorbent fabric such as cotton or bamboo, which helps to wick away moisture and keep the area dry and comfortable. It may be a triangular or diamond-shaped piece of fabric that is sewn into the crotch of women's panties, or it may extend from the front to the back of men's boxers or briefs. Some types of underwear, such as thongs and G-strings, may not have a gusset at all.