24hrs Cold, 12hrs Hot Never need to take a plastic bottle with you again - use this high quality, super-insulated marine-grade stainless steel water bottle (which will not corrode like others) to keep hydrated whilst on the water. The ideal drinks flask for keeping your drink hot during those colder months. Recently voted the best insulated flask by The Independent. 100% BPA Free. And is featured in Outdoors Magic top 100 products!