This is for winter use. It uses materials designed to keep you warm, especially for those who feel cold easily or want to protect their uterus from the cold. The color is black x gray, which makes stains less noticeable. It's made with improved absorbency and a soft-touch fabric. Resale is undecided. * 5 + 1 (bonus) set until December 16th. * From December 17th, it will be sold as a set of 5.