B Free's seam free underwear goes through a special knitting process on circular machinery that creates the super stretchy, comfortable and flattering fabrics that make our garments so popular. Part of the finishing in the manufacturing involves dyeing the garments with a softener to give our seamless fabric the soft and stretchy feel. This added softener means that when your B Free underwear is brand new, you may find that pads and panty liners do not adhere to the gusset very well. The good news is that with washing this will become less of an issue and after several washes most adhesive liners and pads will stick to the gusset just fine.