When you're pushing your boundaries, you need a bottle as tough as steel. With its durable construction and sleek, innovative high-flow design, the hydration you need is always within reach.Double-Wall Vacuum Insulation: Temperature defying chill Lightweight Design: So lightweight you might forget it's there Hours Cold: 14 hours No Squeeze Required: Just grab, lift, and sip 18/8 Stainless Steel: Tough as nails, but doesn't taste like them High-Flow Cap: Logic-defying sipping ease Leakproof Lockout: No spills, all thrills Optimized Cage Fit: Fits most bike cages BPA Free: Ride dirty, drink clean Easy-to-Clean: Made for that post-ride convenience Compatibility: Universal Cap System Wears In, Not Out: Built tough enough to endure the scrapes and scratches that are inevitable with bike cages, both Podium Steel and Titanium will likely eventually show some light wear that doesn’t sacrifice the integrity of the bottle itself. The bright blue tube underneath the Podium® cap is the "Vent Tube." It is the secret to unlocking a high rate of water flow when you tip the bottle upside down to drink. The Vent Tube allows air to enter the vessel, displacing water as it flows out.