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 Bottle�s 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. Mindfully manufactured in Colorado. Lifetime warranty