Cleaning and Caring for Your Ember Cold TumblerUpdated an hour ago
The Cold Tumbler has no electronics, so caring for it is closer to caring for good glassware than caring for an Ember Mug. A few habits keep it looking new.
Washing the glass
The glass vessel is dishwasher safe on the top rack.
Skip abrasive scrubbers and scouring powders, which can leave marks on glass. A soft sponge or bottle brush reaches the bottom easily.
Washing the lid and straw
Rinse the lid and straw after each use, especially after milk-based drinks or anything sweet. Use the included straw cleaner with soap and water to ensure no residue inside the straw.
Once a week or so, take the lid apart for a deeper clean:
- Look inside the lid near the threads for the thin, semi-translucent rubber seal.
- Gently lift it out with a fingertip. It sits in a shallow groove and comes out without tools.
- Wash the seal and the lid separately in warm soapy water, then let both dry completely.
- Press the seal back into its groove so it sits flat. It should rest just inside the lid, above the threads, and be barely visible from the outside.
A straw brush clears the inside of the straw. If the small rubber grommet where the straw passes through the lid comes loose during cleaning, push it back into place from the top of the lid.
The base bumper
The colored base bumper is silicone and simply slides off the bottom of the glass. Slide it off now and then to rinse any drips that collect underneath, dry both parts, and slide it back on until it sits snug against the base. A bumper that feels loose after washing usually just needs to dry fully.
Temperature care
Borosilicate glass handles everyday temperature changes well, but it is still glass. A few standard glassware habits go a long way:
- Let the tumbler come to room temperature before filling it if it has been sitting somewhere very hot or very cold, like a car in summer or a freezer.
- Do not put the Cold Tumbler in the freezer.
- Do not microwave the Cold Tumbler.
Handling
Double-wall glass is sturdier than it looks, but it is not drop proof. Set it down rather than tossing it in a bag, keep it away from the edge of counters, and use the base bumper, which adds grip and protects the bottom edge.
If your glass ever cracks or chips, stop using it and see Cold Tumbler Warranty and Replacement Parts.
Questions? We're happy to help at [email protected].