Glass Tumbler
High-quality glass preserves the taste of your drinks.
Comfortably Cold
Cold Tumbler keeps your iced drinks cold, not your hands.
Double wall insulated
Condensation free and never too cold to hold.
Easy to clean
Made of durable borosilicate glass and dishwasher safe.
Frequently asked questions
How long will my drinks stay cold?
3+ hours for a standard iced coffee (350g ice + 350g liquid) at 72 °F room temperature—without dilution-inducing freezer sleeves or extra ice.
What is the Ember Cold Tumbler made of?
A double-wall temperature-resistant borosilicate glass. The inner wall keeps flavor pure, while the outer wall creates a vacuum-insulated pocket for long-lasting cold drinks and a condensation-free exterior. Lid is made of BPA-free Triton plastic and silicone. Boot is made of silicone. Straw is made of BPA-free plastic.
Is the Cold Tumbler durable enough for daily use?
Yes. It’s built from the same shock-resistant borosilicate glass used in laboratory beakers. A soft-touch silicone boot adds cushioning, prevents slips, and keeps table landings quiet.
Is the Cold Tumbler dishwasher safe?
Vessel is dishwasher-safe. Place lid on top rack only.
Will it fit my car or stroller cup holder?
With a diameter of 2.9 inches the Cold Tumbler is narrow enough for most US cup-holders.
How does the 2-Way Sliding Lid work?
Our 2-Way Sliding Lid screws into place and seals with a silicone gasket. Open the slider to sip similarly to a traditional single use to-go cup or close it and insert the included straw through the straw gasket for simple sipping.
Will the outside sweat or leave rings on my desk?
No. The double-wall insulation eliminates exterior condensation, so your workspace, bag, and cup-holders stay dry.
Why choose glass instead of stainless steel or plastic?
Glass is naturally BPA-free, won’t leach tastes or odors, and lets you admire your drink’s color and layering—no metallic after-taste, no plastic cloudiness—just coffee in its purest form.