This super soft cotton flat mattress protector for cot beds from little green sheep is 100 waterproof extra absorbent and breathable and an ideal accompaniment to our luxury baby crib mattress helping to keep it clean and dry for longer each protector is flat not fitted allowing the mattress to breathe from the sides and underneath whilst also providing flexibility when positioning the protector where your baby is lying it also creates a barrier against dust mites super soft organically