18/8 food grade stainless steel. Keeps liquids hot up to 12 hours and frosty up to 24. 100% BPA free, phthalates free, toxins free. Suitable for acidic and carbonated drinks. Does not retain nor impart any flavour. Sweat-free, does not condensate. Stainless steel lid with leak proof silicone seal. Wide mouth for ice filling and easy cleaning. Airport security friendly. Keeps your drinks cold and hot for hours, lightweight and versatile for all your needs. Sweat-free and space-saving, it is designed to follow you in every adventure. Add more functions with useful lids and accessories. Stainless Steel Bottle with Sleeve