Baby Hugger's underpant is designed to BE YOUR UNDERPANT. The crotch panel opens and recloses for bathroom use. If you have your usual underpant on underneath the Baby Hugger its material will be in the way. Purchasing an extra underpant ensures you won't be without support when washing your Baby Hugger. Baby Hugger provides a unique central lift that takes the weight off the back bladder veins and ligaments to help you feel better and look better during your pregnancy. Baby Hugger protects the ligaments from overstretching.