Designed to function as good as they look. The Chilled reusable water bottles with vacuum insulation keep your water fresh for a full 9 hours. Stainless Steel double wall Thermavac compact vacuum insulation, 9h* cold Soft silicone fingerloop Leakproof Smooth drinking spout Wide mouth opening for easy fill and cleaning Car, bike cup holders and laptop bags friendly Dishwasher safe BPA free, EU-tested safe *Thermal performance lab-test procedure is done by measuring the time that takes for the content’s temperature change from 95°C to 60°C for hot and from 4°C to 10°C for cold, while the outside temperature is held at 23°C. Thermal performance might be different depending on product usage circumstances.