As sub-ohm vaporizers continue to march forward, sub-ohm tanks have had to keep up the pace. The good news is that VaporFi met the challenge with the introduction of the Viper tank and our other popular designs. By adding top and bottom air flow controls, as well as juice flow controls, we have given vapers a way to adjust nearly every aspect of how they vape. Of course, we didn't stop there as there are plenty of other great features in our tanks that maximize your vapor and enhance your flavor. Give them a try!