The HappiBottle 500 ml stainless steel portable thermos has double wall insulation to keep your drinks fresh. Keep your favorite beverages cool for up to 24 hours, and your favorite hot beverage warm for up to 12 hours. With its sleek and glossy blue metallic finish, there's no need to compromise on function and style. Choose from an assortment of colors! Use this as a water bottle at the gym or on the go.