NATHAN Waterbox 250mL Double Wall Glass The double wall glass bottles are designed to be pieces of art as well as long lasting and durable beverage vessels Double-walled for insulation and to reduce condensation Made with food grade materials so it is totally safe to use and has no additional linings Large opening accepts ice cubes and drink mixes with ease Innovative SoftTouch Cap is made of food-grade polypropylene and soft rubber for a sure grip and the cap creates a leakproof seal with the bottle