Made of BPA-free Eastman Tritan co-polyester with excellent impact resistance; top rack dishwasher safe Suitable for both hot and cold beverages (-40 to 212 degrees Fahrenheit) Wide mouth allows for easy cleaning and addition of ice cubes. Opening fits most water filters; Marked with millimeters and ounces for easy measurement. Nalgene Wide Mouth Tritan Plastic Water Bottle Lid Cap, 16oz