The Swell thermal bottles proposed by Nana Bianca are in shades of blue with white stars and a metallic grey cap. Convenient and handy, these stainless steel 500 ml bottles can store your hot drinks for up to 12 hours and cool drinks for up to 24 hours, thanks to their ThermaS’well technology. This feature makes them very functional both on extremely hot days when keeping water cool is an enterprise, and on cold winter days when a hot herbal tea is essential to warming yourself up. The diameter of the mouth is even wide enough to allow you to insert ice cubes! Because of all these features, the Nana Bianca thermal bottles will soon become your most precious ally in all seasons of the year and you will not be able to do without it anymore! Each bottle is made of stainless steel which is non-toxic, has no BPA, and will therefore not release any unwanted substances into the liquids.