From BRUMATE:

Old fashined, lowball, rocks glass, whatever you call it, do it right. We've created the world's most perfect tumbler designed specifically to keep your favorite mixed drinks ice-cold, so your concoctions are never watered down keeping you on the go without the worry of wasting your drink or shattering your glass.

• Dilution proof design
• Includes splash proof lid
• Keeps your drink at the perfect temperature
• Glass-free zone friendly
• 12oz Capacity
• Stainless steel insulated BevGuard tech