The Aqua Vessel Insulated Filter Bottle is the first of its kind-a bottle that not only keeps your water cold, but also filters as you drink. Our sustainable plant-based filter attaches easily to the straw top, so every sip you take is cleaned on its way to your mouth. It is tested to remove 99.9-Percent of Giardia and Cryptosporidium, and its activated coconut shell carbon reduces toxic chemicals, heavy metals, microscopic pathogens, chlorine, sediment and dirt. Our MiraGuard antimicrobial technology even keeps the filter clean and free of mold, so you can be sure that whether you are using tap water or river water, you are drinking the freshest water around. As always, Eco Vessel uses nothing but the highest quality, premium stainless steel to make our bottles. Our vacuum seal insulation technology ensures that your water will stay cold, but your bottle would not sweat. And, the new straw top makes it easy to drink out of when you are on the go-on the trails, on the golf course, at the gym, or just around town. We are dedicated to our bottles, and we are dedicated to you.