Purist Hydroflo for Bike Hugger Specialized Purist Hydroflo bottle with a Bike Hugger Logo Hydroflo delivers a tidal wave of water to your mouth. 100-percent recyclable, FDA approved, BPA free and independently tested and approved by SGS. Unique, three-sided shape fits perfectly in your hand for a solid, controlled grip. To deliver a pure water taste, Hydroflo is infused within silicon-dioxide.