1.This insulated water bottle adopts the new double-layer vacuum principle, which separates the internal and external temperature and keeps the internal temperature constant for a long time. 2.Best water bottles for adults use durable stainless steel material for the internal and external surface of the material, so that the thermoflask feel better and feel better to use. 3.Large capacity, whether you go out to play or go to sports, etc., The big water bottle is a good choice. 4.Durable and long-lasting color,the water bottles for women and men won't lose color with your use.The reusable water bottles keep the color bright and shiny. 5.Easy to carry, even if you go camping, the waterbottle won't take up too much space.