This vacuum insulated 18/8 stainless steel mug has been thoughtfully designed to make your drinking experience as easy and enjoyable as possible. It's tough enough for any adventure while preserving the flavour and aroma of your drink to ensure every sip is perfectly refreshing. The double-walled construction with copper coating keeps your iced tea, cocktail or smoothie at optimal temperature and ensures that the outer wall of the cup does not sweat. Cold drinks stay cool for 17 hours, while hot drinks stay warm for up to 3 hours. Helia also features a convenient, durable glass straw and cleaning brush so you can avoid disposable plastic straws altogether. And you can rest assured that, as with all SIGG products, sustainability and food safety are top priorities, meaning they are recyclable and free from harmful chemicals like BPA.