insulated martini

Common materials include stainless steel (often noted as 18/8 or 304), BPA‑free plastic or glass with built‑in cooling gel, and silicone components such as grip bands or sealing rings.

Martini‑style insulated glasses commonly range from about 9–12 ounces (9 oz and 10 oz are frequent sizes, and 12 oz tumblers are also common); some insulated cup lines advertise a broader range of roughly 6–17 ounces for general drinking cups.

Two main approaches are used: double‑wall vacuum insulation in stainless steel tumblers, and gel‑filled insulated walls in plastic or glass chiller cups (the latter are frozen before use to keep drinks cold).

Care depends on the material: many gel‑filled plastic or glass martini chillers are labeled hand‑wash only, while some double‑wall stainless steel cups are described as dishwasher‑safe or simply "clean with water" in care notes—follow the manufacturer’s instructions.

Double‑wall stainless steel tumblers are described as keeping beverages at the desired temperature for hours; one listing specifically states they keep drinks hot or cold for up to 12 hours.