Equip your employees with this personal protection kit! Each kit features an EVA bag, reusable black face mask and citrus scented hand sanitizer. The mask is one size fits most adults and is made of 95% polyester and 5% cotton. The polyester does not shrink under normal circumstances. Because polyester is made of man-made polymer, which makes the fibers synthetic, the fabric is resistant to shrinkage. If you wash polyester fabric in hot water and then dry it on high heat, it may shrink some, but not a whole lot. Recommend washing in cold/warm water with regular detergent and dry on delicate or lower heat to reduce any shrinking. You can even add full color graphics for promotional use!