By refilling a Stay Sixty bottle you help rid the planet of wasteful and energy consuming plastic bottles. The double-walled design keeps drinks fresh. Fill with water, smoothies, protein drinks, coffee or tea. The unique removable base aids cleaning and filling. Easily fill with ice cubes, fruit, powder drinks or smoothies. The Stay Sixty bottle with removable base is easy to keep clean and hygienic. Other bottles on the market without this feature become a breeding ground for bacteria and need to be replaced. Your body should stay 60% hydrated, let's keep it that way.