We use blown and tempered glass to make KeepCup Brew. Unlike plastic, glass has a wide range of tolerance in ovality and circumference, similarly colour and ambient temperature in lid production can cause subtle changes in the lid.
So each KeepCup Brew is hand fitted with its lid to ensure perfect fit.
To care for the product always use the matching lid. If cleaning in a dishwasher, allow the lid to cool completely before fitting to the glass tumbler.
When placing the lid onto the tumbler you want to hear a distinct "click", letting you know the lid is been securely fastened.