Used from December 2025 to March. All are size M. I did not use a dryer, so there is almost no shrinkage. The penguin pattern is all-season material. The floral and lemon patterns are cotton mesh material. Used and stored in a home without smokers or pets. I can no longer use them due to turning over in my sleep, but there are no frays or noticeable stains, and they seem like they can still be used, so I am listing them for sale. If you wish to purchase items separately from the set, I am open to considering them for 700 yen each, but please consult with me.