Enjoy any drink, cold or hot, with your Tervis Tumblers. Once you try these amazing tumblers, you won't want to use anything else. Tervis Tumbler has been making these exceptional cups since 1946 and no other brand comes close to their durability. UNCONDITIONAL LIFETIME GUARANTEE. Tervis will replace any tumbler that becomes defective. Made of high-grade polycarbonate, the same material used in bulletproof shields and jet windshields. Strong enough to stand up to your family's toughest abuse.Insulated, Clear As Glass-Durable and crystal clear. Your team logo is an embroidered patch inserted between the insulation layer and outside layer. The special design keeps hot drinks hot and cold drinks cold. No condensation or rings on your furniture! The inner and outer walls are bonded together with a super-strong ultrasonic seal. They will stand up to the microwave, dishwasher, and freezer.