Can I pour boiling water directly into this cup?

Yes. The borosilicate glass construction is designed to handle thermal shock, so you can pour boiling water into it without the risk of cracking that comes with standard glass.

Does the cup get hot on the outside when filled with hot liquid?

The outer wall stays cool enough to hold comfortably. The air gap between the two walls insulates the contents, so heat doesn't transfer quickly to the outside surface.

Will this cup sweat if I use it for iced drinks?

No. The double-wall construction prevents condensation from forming on the outer surface, so it stays dry even with cold or iced drinks inside.

How does 250ml compare to a standard mug?

It's about 8.5 ounces, which is smaller than a typical 12-ounce coffee mug but larger than a traditional 6-ounce teacup. It's a middle-ground size that works for tea, espresso drinks, or smaller servings.

Is the double-wall design sturdy or does it feel fragile?

The walls are thick enough to feel solid in hand, and borosilicate glass is more durable than standard soda-lime glass. It's still glass and can break if dropped, but it's built for daily use rather than display.

Cosmos Tea Cup (250ml)

insulated

The 3-second version

Double-wall design traps air to insulate without condensation
250ml capacity fits between a teacup and full mug
Borosilicate glass handles boiling water and thermal shock
Smaller than a standard 12-ounce mug
Glass can still break if dropped
No handle to grip

Why it's on GiftsFeed

Double-Walled Glass Cup That Holds Heat Without Sweating

Most single-wall glass cups look nice but transfer heat so quickly that the drink cools fast and the outside becomes too hot to hold comfortably. Ceramic solves the holding problem but still lets heat escape, and it sweats when you add ice. This design suspends an air gap between two walls, so the outer surface remains touchable and dry regardless of what's inside, and the contents hold their temperature long enough that you're not racing to finish before it goes lukewarm. If you've been microwaving the same cup twice because it cooled before you got to it, or if your desk has a permanent ring stain from condensation, the insulation here is worth the cabinet space.

Good gift when

People who drink multiple cups throughout the day and want them to stay warm
Anyone tired of water rings forming under their cup
Loose-leaf tea drinkers who like to see the color as it brews
Households that need drinkware tough enough for daily microwave and dishwasher cycles

Skip it if If you need a cup with a handle for easier gripping or prefer a larger capacity closer to a standard mug, this won't meet those requirements. The double-wall design also means it takes up more space per unit of liquid compared to a single-wall cup.

Specs

Capacity: 250ml
Material: Borosilicate glass
Construction: Double-walled with air gap
Microwave Safe: Yes
Dishwasher Safe: Yes

What's included

One 250ml double-walled glass cup

If you're giving it

No sizing to guess

Pairs well with loose-leaf tea or coffee, but ships in standard packaging.

The maker

Vahdam Teas sources and sells tea directly from estates in India, cutting out the intermediary steps that usually add months between harvest and cup. The brand operates a social initiative called TEAch Me, which directs a portion of revenue toward education programs for the children of tea farmers. The company was founded to shorten the supply chain and return more value to the growers, and it has expanded its catalog to include tea-related accessories like this glassware alongside the leaf itself.

The details

The double wall traps a layer of air that keeps hot liquids warm longer and prevents the outer surface from becoming too hot to hold. Because the outer shell stays cool, there's no condensation ring forming on your desk or table—the cup stays dry whether you're drinking hot tea or iced brew.

At 250ml, the capacity sits between a traditional teacup and a standard mug. The transparent glass lets you see the color of whatever you're drinking, which matters more than you might expect when brewing loose-leaf tea or pouring layered drinks. The walls are thick enough to feel solid but thin enough that the cup doesn't take up excessive cabinet space.

The material is borosilicate glass, which tolerates temperature swings better than soda-lime glass. You can pour boiling water directly into it without cracking, and it's safe for the microwave and dishwasher. The rounded shape fits comfortably in one hand, and the base is wide enough to stay stable on most surfaces.

This is a cup built to be used daily rather than saved for occasions. The seam where the two walls meet is smooth and unobtrusive, and the rim is finished cleanly without sharp edges. If you've been putting up with lukewarm tea or wet coasters, this solves both problems without requiring you to change your routine.

Vahdam Teas

Cosmos Tea Cup (250ml)

Clear borosilicate construction insulates your drink while staying dry on the outside

$17.49$19.9913% offat vahdam.com

Quantity

Buy from Vahdam Teas

Ships and sold by Vahdam Teas. About this merchant

The 3-second version

Double-wall design traps air to insulate without condensation
250ml capacity fits between a teacup and full mug
Borosilicate glass handles boiling water and thermal shock
Smaller than a standard 12-ounce mug
Glass can still break if dropped
No handle to grip

Cheaper alternatives

Questions

Can I pour boiling water directly into this cup?: Yes. The borosilicate glass construction is designed to handle thermal shock, so you can pour boiling water into it without the risk of cracking that comes with standard glass.
Does the cup get hot on the outside when filled with hot liquid?: The outer wall stays cool enough to hold comfortably. The air gap between the two walls insulates the contents, so heat doesn't transfer quickly to the outside surface.
Will this cup sweat if I use it for iced drinks?: No. The double-wall construction prevents condensation from forming on the outer surface, so it stays dry even with cold or iced drinks inside.
How does 250ml compare to a standard mug?: It's about 8.5 ounces, which is smaller than a typical 12-ounce coffee mug but larger than a traditional 6-ounce teacup. It's a middle-ground size that works for tea, espresso drinks, or smaller servings.
Is the double-wall design sturdy or does it feel fragile?: The walls are thick enough to feel solid in hand, and borosilicate glass is more durable than standard soda-lime glass. It's still glass and can break if dropped, but it's built for daily use rather than display.