The BabyBjorn Cradle fitted sheet is made from organic cotton. The fabric is guaranteed free from hazardous substances and will not trigger allergies. The sheet is tailored to fit the mattress and stays stretched and held in place by elastic bands. Easy to take off and machine-wash. The textiles closest to the child have been tested and approved in accordance with Oeko-Tex Standard 100, class 1 for baby products. They are guaranteed harmless to childrens sensitive skin and will not trigger allergies.