Corkcicle features a shatterproof stainless steel interior lining that doesn't affect or retain taste and is easy to clean. All drinkware products are vacuum sealed, triple-insulated, BPA free, and made from stainless steel. The design features signature easy grip flat sides and a non-slip bottom. The industry-leading, three layer insulation eliminates condensation and won't burn your hands. The canteen Includes a wide mouth for ice cubes and easy filling. Enjoy 25+ hours of cool. 12+ hours of hot.