S'well makes the best bottles on the market. They are triple-layer vacuum-insulated to keep drinks cold for up to 24 hours or hot for up to 12 hours, much longer than other bottles. Made of high quality 18/8 stainless steel. The triple layer also prevents condensation on the outside. The mouth of the bottles are wide enough to allow ice cubes to fit in and are a very comfortable size to drink from. Perfect for keeping hydrated in your everyday life: at work, at the gym or on your travels. BPA free and reusable. Hand wash only. S'Well started 2010 with a bold goal: to rid the world of single-use plastic bottles by being the first manufacturer to combine single-use plastic bottles with fashion and elegant designs for a cleaner, more sustainable world. Since its foundation, S'well collaborates with charities to contribute to the improvement of the environment.