Where is the gusset mentioned in the tights description located, and what role does it play?

In GOYOWEAR's race tights descriptions, you will encounter the specifications of a gusset and flatlock stitching for both men's and women's models^[1][2].

A gusset refers to a diamond- or triangular-shaped piece of fabric added to areas where multiple seams meet, such as the crotch of pants or armpits. If the front and back panels are joined only with straight lines, the seams bunch up and become thick right in the middle of the crotch; the principle is to disperse pressure by inserting a separate piece between them.

Even when taking wide forward and backward strides while running, the crotch does not pull and stretches flexibly. In addition, flatlock stitching, which sews fabrics flat against each other without inner seam allowances, is applied together, helping to prevent the seams from digging into or chafing against the skin even during long runs^[3][4].