Built right into the cap, CrazyCap’s innovative UV light rays are on the same wavelength as the UV used to sanitize hospital operating rooms, water treatment plants, and other industrial applications. Bring this breakthrough science home for a water bottle that’s self-cleaning and chemical-free. CrazyCap’s germicidal effectiveness has been tested, verified, and certified by the industry’s top 3rd-party laboratories. Every four hours, UV rays in the cap automatically activate to kill 99.9996% of microbes and pathogens in your bottle, keeping both water and bottle free of mold, mildew, germs, and odors. Crafted of 304 stainless steel with double-walled vacuum insulation, the botte delivers reliable thermal performance that keeps beverages hot for 12 hours and icy cold for up to 24 hours. It is FDA-certified, food-grade and BPA-free, and also rated IPX7 waterproof by the FCC, CE, and RoHS.