Insulated, high-flow hydration. Ease of squeeze, lasting insulation, and featuring our high-flow Surge cap. This lean, clean bottle is a go-to for cycling or anyone who loves to move fast. The Surge™ cap's design delivers a steady stream then automatically seals for drip-free transport, and our Tri-Layer™ insulation holds the chill for hours. Its slim, ergonomic design is comfortable in your hand, and slides right into your bike's cage. Features. • Max Flow: Surge™ valve technology maximizes flow rate and self-seals to eliminate leaks and splatter during activity. • Engineered Cool: Tri-layer™ Insulation combines an external reflective heat shield with a layers of insulating foam to keep liquids cool. • Easy Squeeze: Flexible, ultra-light materials and the unique grip groove combine for a sure hold and high-flow squeeze. • Built for Bikes: Made with bicyclists in mind, the Polar Surge bottle fits a variety of Bike frame sizes and bottle cages.