High-flow Surge valve provides a sip or a blast of water and self-seals to eliminate spill and splatter on your bumpiest ride Spill-proof when open and pushes closed for leakproof transport Engineered cool, Tri-layer Insulation takes Polar BottleÌ_ås recognized radiant heat reflective technology to the next level, keeping your bottle way cooler, 2X longer Unique grip groove and wall design makes it easier to squeeze Bottle shape and size is compatible with most bike cages Removable nozzle for easy cleaning & dishwasher safe 100% BPA free & food safe