Bienen Unisex Newborn Infant Baby Girls Boys Toddlers Cotton Sleep Cap Headwear Lovely Hat Lens Cotton Cap(Single Pink). material:Cotton. Designed with safety in mind this hat is completely breathable, so that you can feel good about putting it over baby's delicate skin and eyes. Keep baby head temperature and reduce heat loss,which can prevent colds. Keep your baby happily asleep in the stroller, in the car,at home. Thanks to the unique, fold-down mask that blocks out light.