XtremeproteX™ Technology XtremeproteX Hand & Mask Spray is formulated to kill bacteria and viruses. When applied to your mask and hands, it provides continuous viral protection to the wearer for extended periods. Additionally, it has a clean, fresh, fragrance that refreshes and extends the life of your mask. Our mask spray is safe for humans–not for bacteria and viruses. The formula is natural, non-toxic and doctor recommended.