This vacuum-insulated mug made from 18/8 stainless steel has been thoughtfully designed to make your drinking experience as simple and enjoyable as possible. It is sturdy enough for any adventure while preserving the taste and aroma of your beverage, ensuring that every sip is perfectly refreshing. The double-wall construction with a copper coating keeps your iced tea, cocktail, or smoothie at the optimal temperature and prevents the outer wall of the mug from sweating. Cold drinks stay cool for up to 17 hours, while hot drinks remain warm for up to 3 hours. Helia also comes with a convenient, durable glass straw and a cleaning brush, allowing you to completely avoid single-use plastic straws. And you can trust that, as with all SIGG products, sustainability and food safety are top priorities, meaning they are recyclable and free from harmful chemicals like BPA.