Sleep tight is a patented product designed to help children sleep undressed during the night. it also helps prevent children from falling out of bed in beds without railings. it is easy to use thanks to the double-sided zipper sewn into the flexible fabrics on the sides of the duvet cover. it is 100% cotton fabric. set contents1 duvet cover1 fitted sheet1 35 x 55 pillowcases1 50 x 70 pillowcases it is recommended to be used with a 90 x 170 duvet. washing at 30 degrees is suitable. drying is not recommended. Improved version for clearer understanding and better search visibility. Suitable for users seeking detailed and reliable product information.