Oasis Drink Bottles harness double wall vacuum insulation technology to significantly reduce heat transfer by conduction or convection. This technology prevents condensation from building on the exterior when storing cold drinks, and likewise, remains cool to touch when storing hot drinks. By using vacuum insulation technology, drinks remain cold for up to 24 hours or hot for up to 12 hours. External factors cannot permeate the bottle's exterior - perfect for Australia's diverse climate. Made from quality 18/8 grade stainless steel inside and out, Oasis Drink Bottles are highly-resistant to rust, are odourless and built to last a lifetime. Each bottle features a tight-fitting stainless steel twist cap with a silicone seal designed to ensure no leaks. Care and Use Instructions: Handwash bottles. Available in a range of colours with a matte finish, blank or personalised in your choice of coloured permanent vinyl label or engraving. Pour through sipper lids also available as an alternative to the screw top lid here