Oasis Stainless Steel Insulated Water Bottle with Handle 500ML - SilverOasis 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 bottles exterior