The Stokke® Sleepi™ Organic Protection Sheet for crib is designed to be laid-over a Sleepi crib mattress. It protects a mattress from moisture throughout the night with soft organic brushed cotton protector. The Stokke® Sleepi™ Protection Sheet uses two layers of thick brushed cotton with a breathable waterproof membrane laminated in between to ensure that your mattress stays clean and healthy while your child is peacefully sleeping. Free of any pesticides, insecticides, heavy metals or chemicals.