TRI-LAYER INSULATED WATER BOTTLE - Polar Bottle is the original, 100% BPA-free bicycle water bottle. The updated Breakaway Insulated Water Bottle features triple wall insulation, keeping your liquid cooler 2X longer than older models. HIGH-FLOW, SELF-SEALING CAP - The Breakaway Surge Cap maximizes flow rate and self-seals to eliminate spills and splatter. It’s spill-proof when open and pushes closed for leakproof transport.