霜凍冷萃玻璃杯

The thick glass keeps my cold brew properly chilled without diluting it, even when I'm sipping outside for an hour. It's heavier than my old tumbler but that's exactly why I reach for it on hot afternoons.

Iced coffee stays cold way longer in this than my old mason jar, and the glass feels thick without being clunky. The freezer trick actually works, though I did forget it in there once and had to wait a bit.

The glass keeps my cold brew genuinely cold for hours, and the thick walls mean no condensation ring on my desk. I've been making iced coffee at home all week just to use it.