This is for winter use. It uses materials designed to keep you warm, especially for those who are sensitive to cold or want to protect their uterus from the cold. The color is black and gray, making stains less noticeable. It's made with improved absorbency and a soft fabric. Two sets are available. Resale is undecided. * Until December 16th, it's a set of 5 + 1 (bonus) pieces. * From December 17th onwards, it will be sold as a set of 5 pieces.