The Elite Nanogel Ombra Bottle 500ml is a revolutionary thermal bottle for both hot and cold drinks, constructed using Nanogel. Nanogel is the world's lightest and best performing solid insulating material. Nanopores within the structure of the material trap gas molecules and offer a drastic reduction in heat transmission. This also makes the Nanogel material light and highly flexible, and when combined with Elite's unparalleled experience in bottle design and construction, the end result is a lightweight, squeezable bottle with unsurpassed thermal performance. Elite Nanogel Ombra Bottle 500ml Features Oversized, high-flow Ombra valve for ease of use Soft squeezable casing gives high volume refreshment whilst on the bike Available in 650 or 500 ml sizes Large opening aids cleaning and refilling Keeps drinks hot or cold for up to 4 hours Dishwasher safe and BPA-free