This is a GENUINE Tervis Tumblers. As the original and oldest insulated tumbler brand in the USA, Tervis is well known nationwide. Features: Bullet proof strength made from high grade polycarbonate makes the tumbler virtually indestructible. Crystal clear as glass. Double-wall insulation keeps hot drinks hot and cold drinks cold. No sweating - reduces need for coasters. Freezer and dishwasher safe. Lifetime unconditional guarantee.