Durable single wall frosted Borosilicate glass. Halcyon soft touch feel coating. Push button flip action lid. Easy fill wide opening. Top shelf dishwasher safe. Bottle has the ability to withstand extremely hot temperatures without breaking but will be very hot to the touch. To prevent burns, we do not recommend using for hot liquids. Packaged in reinforced, protective cartons for no additional charge. If the bottles do happen to break, Borosolicate glass will not shatter into shards or sharp pieces like traditional glass. Instead it will break apart into chunks.