MDOG Black Mulberry Silk Sunscreen Face Mask For Men UPF50 . Made from 100% mulberry silk, offers 5.4 times the breathability of regular masks. Effectively blocks over 98% of ultraviolet rays, achieving the highest international UPF standard certification (50 ). Can be repeatedly washed without compromising sun protection effectiveness. This sunscreen face mask has an adjustable drawstring, suitable for all head circumference.