Stelton's Keep Cool water bottle is a safe, stylish and ecological way to carry drinking water with you wherever you go. Created by Italian design duo Daniel Debiasi and Federico Sandri, the beautiful bottle combines a minimalist form with considered details. The Keep Cool bottle is made of coated stainless steel and it keeps your beverages and delicious smoothies fresh and cool for up to 16 hours, and coffee and tea hot for 8 hours.