LYT's Self-Cleaning Stainless Steel Bottle in Cool Gray is your family's new favorite tech! Built right into the cap, the hardworking ultraviolet rays are on the same germ-killing wavelength as the UV used to sanitize operating rooms, water treatment plants, and other important places. The best part? It's 100% chemical-free so you can sip back and relax! The LYT bottle stops bacteria and germs from breeding inside your water bottle. Every 4 hours, UV rays in the cap automatically activate, keeping your water 99.9% fresh and clean-and the bottle free from yucky mold, mildew, microbes, odors, and everyday funk. Even better, it's durably crafted of BPA-free 304 stainless steel with double-walled vacuum insulation-making it virtually indestructible. It stands up to the occasional drop, won't leak, maintains hot beverages for 12 hours, and keeps drinks icy cold for up to 24 hours without breaking a sweat.